So if I'm reading your message correctly, maybe I'll be able to run an Amiga emulator on the G4 Mac, and THAT would be able to read the Amiga format Syquest?
Yes, that's right, you MIGHT be able to. The problem is that the PowerPC macs are now so old that the emulators are not up to date. I've spent a little time looking into emulating an Amiga on PowerPC MacOS, but it looks challenging, especially when I can run MorphOS on the same system.
I'm assuming that the Mac's " dmg" disc image format isn't something the PC can read.
I've not tried it myself but quickly did some research and it appears you can use 7-zip on Windows to extract .DMG files.
It's a shame you are so far away, if you were local this is the sort of challenge I'd happily spend a free day to try and resolve.