@Dr.Venom

As an alternative you can try the XM6 (x68k emulator).
This emulator has a option to create a new disk with or without logical formatting.
If the new disk is formatted then you can use the DiskExplorer to edit the disk (content).
http://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html

PS: If I have time, I will check the MESS driver in detail.