Luckily for that guy, someone has made a MFM-to-SD-card with arbitrary command and geometry transformation recently, it it has turned out to be great. There are MFM-to-SCSI and even SCSI-to-floppy interfaces. The great thing about SCSI in the middle is that it's the same protocol supported by systems today so you could then just convert using generic hardware and software available right now. The system on the other end is none the wiser and thinks everything is still the old interface with the old parameters.