I was actually chatting with the author of OmniFlop. He's a very helpful guy and asked me to send some FM Towns FD images so that he could analyse them and try to implement support in OmniFlop. He did write back to me and say it is possible with a bit more analysis
He then requested that I send him some original FM Towns floppy disks also. Unfortunately I don't have any of these but my friend who has 50 original games does. Trying to convince him to part with these for a few weeks is difficult (which is understandable) so no real progress has been made
PS. I like your avatar, is it from the homebrew version of Frog Fest (Neo-Geo)?