I'm totally viewing this from outside....but maybe as time progresses demand for CDIs may increase....the only thing working against it may be the need for an original spec functioning stator??...Hi Charles,
your dad appears to have had a dream and the drive to make it reality. Great stuff indeed. As far as I can see from the pictures provided this CDI is very similar to mine. It must be since that's more or less the only way to make it work in a cx500. I have the feeling that my son will one day find all my components and wonder what to to with it, as you do now.
I did not give one away yet, so I guess the demand of a CDI replacement is very low. There are a few struggling with it, posting a lot of stuff in various forums and in the end dismantle the cx and sell it in pieces or install ignitec. If we had not this corona restrictions I would have had various oportunities to discuss CDI replacement with other cx owners,though, it may change next year, famous last words ...
I'd suggest trying to find the schematics, I'm more than willing to support you in matters of reading and explaining it. Then you could either give the entire project away to an enthusiastic successor or try selling it to other cx owners to keep more cx alive in the US. Either way would keep you dad's vision alive.