Yesterday, or should I say yester-night, the C64FC started talking USB and now enumerates as a USB HID device. The road from here to having a finished product appears to be a straight path! Since the DPRAM is the most expensive component, I'm saving it until the end.
This was a huge step forward for the project. What I need now is a USB VID/PID combo, anyone with deep wallets out there? ;-)