You don't need the Gecko codes nor the GCT file if you're already playing Redux. The patch with all the Gecko codes is already implemented, so no need to screw with Gecko stuff and such.
It worked great so far. Only some cutscenes are like blury (double image like) I don't know how to get the gecko codes to work they keep disappearing after I add em, I also don't know how to get that gct file to work.
The entirety of the Japanese version is found within the US one, the check is done whether it detects a Japanese or a US Wii, that's what makes the change.
As for the request, sadly that's not really feasible for this particular project, as it...
Is it possible to play the game in Japanese with the new subs or is that something yet to come?
I imagine I need the Japanese version unless it's somehow implemented on the US version.
I love it either way this has actually gotten me to replay...