Actually, now that I know you're not planning on doing the whole thing, getting MT-32 tracks for you doesn't seem like such a daunting task anymore. How much of the game are you intending on doing anyway?
Nexusle, this is an AGS game which, right now, isn't cross-platform (though there are ways to port it to Mac, but definitely not ScummVM).
"Booyah! Look out, LeChuck! Here comes Guybrush Threepwood's glowing sword of hot monkey vengeance!"
-Guybrush Threepwood, Tales of Monkey Island