So, to confirm the scattered reports out there, component video, using the JROK component only board, DOES work fine on a Duo, in this case, a DuoR. Got it all hooked up last night in process on another mod and BAM!
One note about doing this, you need to get the sync signal off of the composite video output, not from the #44 pin on the processor. And you need to strip the signal, in my case with the LM1881.
So, now what to do with those encoders I have.....