I would actually be interested in this seen as how I already got ACNL loading the Gamecube Hourly music with Layered FS. This would render the game only playable in a signature patched mode, right?
It's easy to have custom music with LayeredFS (I did it for my AS HackRom), but not with a PatchUpate.cia.
It's possible, but i need to make some test
I'm near to finish the tutorial