There isn't a real need to emulate an external SCSI drive. Just take a SCSI2SD and put it in an enclosure. I'm sure that's pretty much the same thing.

But I suppose you could chop off the jack off a old printer cable and create a simple adapter for it if you want the drive to hang off the back like the FloppyEmu can.

If SCSI2SD can run off termination power that is. Otherwise you would still need an external power supply of some kind. That's the thing most enclosures take care of.