To each their own, but I've always questioned the logic in buying these alternative small outboards. Small four stroke obs from the reputable companies are darn near bullet proof, reasonably priced (by boating standards), economical, powerful, light, quiet and clean running. Why bother trying to outsmart that?
How hard is it to not let fuel sit? If you aren't going to use it for a few months just pour it into your car's tank and move on. Some people say they aren't comfortable storing gas on their boat. You can't put a 2 gallon jerry jug on your deck somewhere? Gas motors require very basic periodical maintenance, but so does every other mechanical thing, obviously including propane outboards.
I lump the Torquedos and their ilk into this same category. Unless you live on a lake that does not allow gas motors, why pay more for something that is unproven, impossible to work on and more expensive? I've had plenty of electric trolling motors on my fishing boats over the years and every single one of them has been super unreliable. Especially the ones used in salt water, even the salt water series from Minn Kota, who have been making electric boat motors for a really long time.
That said, I'm sorry, OP, that you are having issues and I hope they work out. We were over in the Bahamas a few years back and docked behind a couple that had a nearly new Lehr that wasn't running. They couldn't get parts or get it worked on, which meant no dinghy, no anchoring out, no snorkeling, no deserted beaches etc. Which meant their Bahamas trip was pretty much ruined. I felt terrible for them. They were considering buying an outboard over there to get them through their trip.