Hi Ed,
Check the flea market section, there are a couple of machines listed that maky still be available, some even within a reasonable drive of your location.
When you get one, show us a picture. Good luck!
Luckily for me, I don't currently need any warranty work; at this point the best I am hoping for is that repair/replacement parts will be available as I use and break/wear out my machine.
I'm sure you will be able to count on me as a future customer.
But you have done an excellent job of capturing every most likely charging scenario. I'm excited to see this much interest in developing alternative charging solutions.
It sounds like there is a market for a compact, light weight charger that operates on standard 110v outlets, even if it does take longer to achieve full charge. Especially amongst the EXR crowd.