After finally getting the DLC to work (it was an ordeal for some reason, I needed JPN locale emulation for the DLC to show up, that shop didn't automatically create the proper file for it), the patch works! Amazing, I can finally read what I'm tapping on lol! If I don't use JPN locale emulation, the DLC won't work. Maybe this helps someone else coming across this. Might be a good idea to have a locale.txt as part of the archive, that way any user installing this will have the proper file, regardless wheter
that shop's app created it for you or not.
I notice that all of the regular songs have English names, yet all of the DLC songs still have the names in Kanji / Katakana. Is this intended, and if not, any idea how to fix it? I did try importing the provided savegame, which changed the name of my character but I'm not sure what else it is supposed to do.
Either way, thanks a bunch