Have you tried a kernel parallel port driver (such as UserPort) to run your software under WindowsXP instead of Windows98?
I find your work very exciting. There are already several Floppy disk simulators in the works, one uses USB, the other Compact Flash cards and a MCU (no host)... all not on sale and looking expensive...
If your software could be made to run under WindowsXP (at the right speed) then I would definately buy a cable and the software (depending on the price).
If you used long ROUND floppy cables (aesthetically more pleasing) I'd be even more interested

Your solution should (with a little work) be able to run IPF (Software Preservation copy protected images) as well as ADF etc. by using their DLL. That would be VERY cool.
http://www.softpres.org/downloadMove now... a bit of good marketting on the right channels and you could have a winner on your hands. You could even expand to C64, Spectrum etc.