I used to use Catweasel Mk.3 for accessing floppies of all kinds - FAT, FFS, HD, DD, etc. (Not DiskSpare unfortunately - never could get that to work. Hardware-banging driver.)

It worked quite well, except that there was something up with either OpenPCI, the driver, or the FFS2 filesystem that locked the machine every so often on mount, which meant I couldn't put the mount file in DEVS:.

I never even tried to connect up the internal floppy at the time. I was told it just wasn't supported because time was best spent on something else. And to be honest, it was true. I never got much use out of the CW3 except to load old floppies which I'm sure these days I can find on the internet in DMS or ADF.