Thanks Gary. That idea sounds very workable. It will likely be the path I follow. I'll update my progress in the weeks (months?) ahead.
On another note.... this is the first time I've ever worked on one of these engines. I find the design very interesting. It's simple, that's for sure, and easy to work on. The cylinder jug / valve housing is a very rough casting. It seems no effort at all was expended to finish it for appearance sake. Once the cylinder is removed, the crankcase looks hunchback. Also, instead of the bottom of the cylinder jug being open right into the crankcase it's pretty much closed. There's just a rectangular slot for the connecting rod to pass through. I love how easy it is to remove and install the valve keepers. Instead of two clamshells it's just a pin that passed through the valve itself. Push down on the spring, pull with a pair of needlenose pliers and you're done. Of course you have to remove the cylinder to get at them! Then there's the large bolt in the head...right next to the spark plug. It goes straight into the combustion chamber. I have to wonder why it's there.