not my main priority right nowYou could create an application to convert WAV to brstm.
His works are excellent.
I am working on "SOON!2", "Homebrews Are Coming SOON!", "Howling Theme Tool", "Player's Heaven", "Gimme 300 coins!"... and a lot of more.
Too work for one people.
There is already a good one created, check his thread here:
https://gbatemp.net/threads/release-brstm-bcstm-conversion-tool-beta.378702/