I used the instructions here (https://learn.adafruit.com/usb-next-key ... icro/parts — I got the DIN from DigiKey) to build an adruino-based adapter. It mostly worked, but the Mac-specific task switching-commands (Command-Tab, etc.) were problematic (having it connected but using it only for typing was less than ideal).
I need to go back and redo the wiring for it, and try to figure out if I can fix the code. If anyone has figured out how to get it to work right, please share. This is one of the very best keyboards I've had the pleasure to use, and I'd love to get it back into regular service.