[Win] Customizing Japanese keyboard layout

[CosmoCortney]

Hello, for some time I've been using Microsoft's Keyboard Layout Creator (MSKLC) to modify the German input layout. I had no troubles so far. But this tool doesn't seem to be able to export custom Japanese layouts (even though it works perfectly fine in test mode).

This is the log:

Spoiler: Log

WARNING: The character ¡ (U+00a1) exists in the entry for VK_1, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ¬ (U+00ac) exists in the entry for VK_1, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ä (U+00e4) exists in the entry for VK_A, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ä (U+00c4) exists in the entry for VK_A, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ç (U+00e7) exists in the entry for VK_C, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ç (U+00c7) exists in the entry for VK_C, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ë (U+00eb) exists in the entry for VK_E, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ë (U+00cb) exists in the entry for VK_E, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ï (U+00ef) exists in the entry for VK_I, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ï (U+00cf) exists in the entry for VK_I, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ñ (U+00f1) exists in the entry for VK_N, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ñ (U+00d1) exists in the entry for VK_N, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ö (U+00f6) exists in the entry for VK_O, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ö (U+00d6) exists in the entry for VK_O, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character © (U+00a9) exists in the entry for VK_R, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ß (U+00df) exists in the entry for VK_S, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ẞ (U+1e9e) exists in the entry for VK_S, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ü (U+00fc) exists in the entry for VK_U, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ü (U+00dc) exists in the entry for VK_U, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ÿ (U+00ff) exists in the entry for VK_Y, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character Ÿ (U+0178) exists in the entry for VK_Y, ShiftState 'Shift+Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ¯ (U+00af) exists in the entry for VK_OEM_MINUS, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character ¿ (U+00bf) exists in the entry for VK_OEM_2, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The character € (U+20ac) exists in the entry for VK_OEM_7, ShiftState 'Ctl+Alt' of the layout table and is not in the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: \ (U+005c) is already defined more than once on the keyboard (on VK_OEM_102, ShiftState 'Base' and VK_OEM_5, ShiftState 'Base').
WARNING: (U+001c) is already defined more than once on the keyboard (on VK_OEM_102, ShiftState 'Ctrl' and VK_OEM_5, ShiftState 'Ctrl').
WARNING: '|' defined on OEM_5 (Shift) but not defined elsewhere. This key may not be present on all keyboards.
WARNING: The dead key ´ (U+00b4) when combined with a (U+0061) returns á (U+00e1), but á (U+00e1) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with A (U+0041) returns Á (U+00c1), but Á (U+00c1) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with e (U+0065) returns é (U+00e9), but é (U+00e9) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with E (U+0045) returns É (U+00c9), but É (U+00c9) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with u (U+0075) returns ú (U+00fa), but ú (U+00fa) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with U (U+0055) returns Ú (U+00da), but Ú (U+00da) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with i (U+0069) returns í (U+00ed), but í (U+00ed) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with I (U+0049) returns Í (U+00cd), but Í (U+00cd) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with o (U+006f) returns ó (U+00f3), but ó (U+00f3) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with O (U+004f) returns Ó (U+00d3), but Ó (U+00d3) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with y (U+0079) returns ý (U+00fd), but ý (U+00fd) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ´ (U+00b4) when combined with Y (U+0059) returns Ý (U+00dd), but Ý (U+00dd) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for '´' (U+00b4) should be a space (to create a spacing version of the dead key).
WARNING: The dead key : (U+003a) when combined with a (U+0061) returns ä (U+00e4), but ä (U+00e4) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with A (U+0041) returns Ä (U+00c4), but Ä (U+00c4) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with o (U+006f) returns ö (U+00f6), but ö (U+00f6) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with O (U+004f) returns Ö (U+00d6), but Ö (U+00d6) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with u (U+0075) returns ü (U+00fc), but ü (U+00fc) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with U (U+0055) returns Ü (U+00dc), but Ü (U+00dc) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with e (U+0065) returns ë (U+00eb), but ë (U+00eb) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with E (U+0045) returns Ë (U+00cb), but Ë (U+00cb) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with i (U+0069) returns ï (U+00ef), but ï (U+00ef) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with I (U+0049) returns Ï (U+00cf), but Ï (U+00cf) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with y (U+0079) returns ÿ (U+00ff), but ÿ (U+00ff) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key : (U+003a) when combined with Y (U+0059) returns Ÿ (U+0178), but Ÿ (U+0178) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for ':' (U+003a) should be a space (to create a spacing version of the dead key).
WARNING: The dead key ¯ (U+00af) when combined with a (U+0061) returns ā (U+0101), but ā (U+0101) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with A (U+0041) returns Ā (U+0100), but Ā (U+0100) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with e (U+0065) returns ē (U+0113), but ē (U+0113) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with E (U+0045) returns Ē (U+0112), but Ē (U+0112) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with u (U+0075) returns ū (U+016b), but ū (U+016b) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with U (U+0055) returns Ū (U+016a), but Ū (U+016a) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with i (U+0069) returns ī (U+012b), but ī (U+012b) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with I (U+0049) returns Ī (U+012a), but Ī (U+012a) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with o (U+006f) returns ō (U+014d), but ō (U+014d) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ¯ (U+00af) when combined with O (U+004f) returns Ō (U+014c), but Ō (U+014c) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for '¯' (U+00af) should be a space (to create a spacing version of the dead key).
WARNING: The dead key ` (U+0060) when combined with e (U+0065) returns è (U+00e8), but è (U+00e8) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with E (U+0045) returns È (U+00c8), but È (U+00c8) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with a (U+0061) returns à (U+00e0), but à (U+00e0) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with A (U+0041) returns À (U+00c0), but À (U+00c0) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with u (U+0075) returns ù (U+00f9), but ù (U+00f9) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with U (U+0055) returns Ù (U+00d9), but Ù (U+00d9) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with i (U+0069) returns ì (U+00ec), but ì (U+00ec) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with I (U+0049) returns Ì (U+00cc), but Ì (U+00cc) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with o (U+006f) returns ò (U+00f2), but ò (U+00f2) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ` (U+0060) when combined with O (U+004f) returns Ò (U+00d2), but Ò (U+00d2) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for '`' (U+0060) should be a space (to create a spacing version of the dead key).
WARNING: The dead key ^ (U+005e) when combined with a (U+0061) returns â (U+00e2), but â (U+00e2) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with A (U+0041) returns  (U+00c2), but  (U+00c2) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with e (U+0065) returns ê (U+00ea), but ê (U+00ea) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with E (U+0045) returns Ê (U+00ca), but Ê (U+00ca) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with u (U+0075) returns û (U+00fb), but û (U+00fb) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with U (U+0055) returns Û (U+00db), but Û (U+00db) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with o (U+006f) returns ô (U+00f4), but ô (U+00f4) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with O (U+004f) returns Ô (U+00d4), but Ô (U+00d4) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with i (U+0069) returns î (U+00ee), but î (U+00ee) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ^ (U+005e) when combined with I (U+0049) returns Î (U+00ce), but Î (U+00ce) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for '^' (U+005e) should be a space (to create a spacing version of the dead key).
WARNING: The dead key ~ (U+007e) when combined with n (U+006e) returns ñ (U+00f1), but ñ (U+00f1) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ~ (U+007e) when combined with N (U+004e) returns Ñ (U+00d1), but Ñ (U+00d1) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ~ (U+007e) when combined with o (U+006f) returns õ (U+00f5), but õ (U+00f5) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ~ (U+007e) when combined with O (U+004f) returns Õ (U+00d5), but Õ (U+00d5) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ~ (U+007e) when combined with a (U+0061) returns ã (U+00e3), but ã (U+00e3) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: The dead key ~ (U+007e) when combined with A (U+0041) returns à (U+00c3), but à (U+00c3) is not on the default system code page (932) of the Japanese (Japan) language you specified. This may cause compatibility problems in non-Unicode applications.
WARNING: By convention, the last entry in the dead key table for '~' (U+007e) should be a space (to create a spacing version of the dead key).

This is followed by:

Does anyone here know a fix for this or an alternative tool?
Thanks

EDIT: I tried SharpKeys and Clavier+ but they lack important dead key features it seems