I found a CDI from another bike (unknown, but suspect an RM80), and was able to wire it into the harness which was simple. The RM has a simple three phaze stator, and really just goes to the CDI, and then the CDI feeds the coil.
I was able to get a weak spark out of it, but it not putting out enough. I also suspect the rotor magnets are also weak, I may replace that. The stator is new, as is the coil.
My worry with another CDI is simply that the ignition curve would not be correct, possibly hurting the engine. I have a bead on a few fleebay CDI's, so I may just go that route