Breath of Fire 2 SPC hacking

SPC files hex data is not even close to being the same as the actual song data. It would need to be converted first in order to search for it in the ROM, and unfortunately there's no such program that does this. ;(

The 'simplest' way would be to locate the song pointers and just change the one in question to the other one.

Exactly, since this NPC triggers an event that swaps the pointers in the ROM itself. Pinpointing it would be a real PITA to say the least. Unfortunately, no one has accepted the challenge to do so.