Well, that's fun. Popped the drives back on the Kaypro 2, inserted the floppy and it booted right into CP/M 2.2.
Ran a couple of commands. Worked nicely. Then on the next command I ran the prompt hung. Restarted it and it prompts for the boot disk but doesn't read from the either floppy now. Drives still both work fine directly on #greaseweazle.
So... worked for a few minutes, then the drive controller or something in it seems to have crapped out. <sigh>