Got some feedback from the quick proof of concept video I put on YouTube: "Does it work with MUNT MT-32"?
Never heard of MUNT before but downloaded it, found the ROMs, set the output in my Hatari MIDI Mapper as "MT-32 Synth Emulator", started Hatari and Cubase and loaded up The Secret of Monkey Island.mid, which is specially made for MT-32, and it played great!
It was I who commented on your YT video. Looking to test your “Hatari MIDI Mapper” application if possible! 🙂