You can already run Monkey Island using PocketScumm. And it runs perfectly with sound. As well MI2, Simon the Sorcerors, Indiana Jones, Sam & Max, Day of the Tentacle etc. I played through Simon the Sorceror 1 recently using it. Too bad I only have floppy version and not the Talkie. Gonna order it though.
But I do have the talkie of Day of the Tentacle and that was quite fun to do and play on the go.
As for Dungeon Hack, get the DosBox. There's a whole thread on it on Pocketmatrix.com. Do a search on the forums and use their conf file.
JJB