Today I got the tiny development kit for DC2N4 low-cost. I was able to flash my code and interact with it over the USB serial connection without issues.
What I need to test is whether or not I can achieve a USB throughput sufficient to avoid buffer overflows in DC2N4. I think I might be able to complete testing by the end of the week. If successful, I will design the PCB and sent it out to production as soon as I am confident I can fit it in an enclosure easily.