@Gav
Well, since you have a SCSI controller then I maybe have some good news for you. I have a SCSI ZIP drive that I´m giving away, you just have to pay postage.
As I have no ZIP disks I can not test it, so it might not be working, but if you want it, it's yours. If it solves your problems I don't know, but the drive is free of charge.
-EDIT-
By the way, anyone else is free to have it as well :-)