recommendations for modding Scumm v3

[Sushi]

I have taken on the challenge to replace the kazoo music in the FMtowns version of Zak with the original "pop goes the weasle".
Unfortunately it isn't simply one of the flac files to replace.

I have been toying around with some of the scumm un/repacker and editor tools out there, but they either do not support this scumm version (v3 that is)
or if they're able to export all the data, I still have no clue on how to determine which block is this sound clip.

As most referenced sites for these tools are dead, I was hoping to find some experts here.

Any ideas?