>>55809998ok, i was able to do it
1. extracted the .sseq, .sbnk and .swar files from the original platinum rom using rom editor (the wild mon theme uses the BA_POKE sequence, trainer battle theme uses BA_TRAIN sequence, both themes use the same bank and wave archive files BGM_BATTLE.sbnk, BASIC.swar and BGM_BATTLE.swar)
hopefully these are the only remixes in the rom
2. next, used tinke to open the modded rom with remixes, navigate to sound_data, and change the files individually using the ones extracted from the original rom