You can update the game, that' not a problem and you don't need to be signed in to PSN to be able to download the updates.
That's right, signing in to PSN on CFW might get you banned.
There's your problem, if you have the BLES region, you need the BLES DLC. There might be ways to make a BLUS DLC work on a BLES region, but it would be better if you get the BLES DLC.
RIFs and RAPs are files needed to activate PSN content using reActPSN. You don't need those if the PSN content is patched.