It wouldn't be difficult if you would just say what you want. Wyz asked you "You want to play classic games and have the music sound as if played with a Mt-32 module?" And you said "not exactly." Then WTF do you want?
Could you give straight answers to these questions?
-What do you want it to sound like?
-What kind of hardware do you hope to use to produce the sounds?
-Within which applications were you hoping it would work?
Then people can tell you if it's possible, and if so, what you need to do to make it work.
If, after all, what you want is what Wyz said, you already have your answer. It's not just a matter of switching out the sound banks, you also have to emulate all the MT-32 commands and sound processing. That's what munt is for.