Could you take an old Mac on MacOS 8.x or 9.x.x that you have lying around the house, connect it to your spiffy modern "legacy-free" MacOS X.x.x Mac via a crossover ethernet cable (or a swich or router), and use file sharing to access the older SCSI devices, printer, floppy, etc. via the old Mac ?
If so, I guess an old beige G3 might be the best old Mac for this purpose - I think it is the latest and greatest of the SCSI Macs.
I dunno if this would work - using a networked older Mac as a "legacy device server" - but it just might.
People here would know.
Pretty much free if you have an old Mac lying about.
If you do not have an old SCSI Mac - they are going pretty cheap, now.
Just an idea -
Epaminondas