SASI device <-> PC ?

Has anyone here successfully interfaced a SASI device to a PC at the hardware level? I've got a few classic systems which use SASI (or not-quite-SCSI) controllers to talk to SASI-ST506 bridge boards and from there to ST506 type drives. As has been documented many times in the past here, an ST506 drive has a pretty tight relationship with its controller, and so hooking up the drive to a different controller (say MFM controller in a PC) causes all sorts of problems when it comes to backup. Hence driving the SASI side of things (and preserving the drive/bridge board relationship) would seem like a sensible move when it came to backing up data. In theory data could then be restored to a replacement drive if/when the original dies via the same method. Presumably inventing a simple SASI board to hang off a PC parallel port (say) is a lot easier than mucking around with the equivalent for floppy drives - or is the data rate still likely too low to cause timeout problems within the bridge board's firmware? I've got several Acorn, Torch and RML machines which use bridge boards and in most cases the tools needed to back up and restore data have long since vanished off the face of the earth (my RML fileserver's a particularly important one as it seems to be the only one left in the world) cheers Jules