What exactly is it that has you convinced that a computerized carburator is the cause of the problems? Engines have been steadily going that route for years. It adds to the costs of engineering and manufacturing, and every other aspect of product development. Do you imagine that the OEMs are doing this because it makes the products less reliable, so they can sell more saws? The numbers tell a different story. Personally, I find the saws much easier to start, they adjust to changing temperatures and atmospheric conditions a whole lot faster and better than I can do by constantly retuning them, and I've had a lot less issues with them.
Either one of us is very lucky, and the other very unlucky, or there's something else that explains it. Every OEM kicks out a lemon from the factory, once in awhile. You might have just gotten one or two. I've only had one C model Stihl give me problems, and the dealer took care of it right away. It had nothing to do with the carburator being electronic... I added fuel on a windy day and something blew in the tank... they cleaned the tank and carb and that was the last time it gave me any trouble.
I would think that you could convert it, with an aftermarket carburator, but I honestly don't know how much work that would be. Perhaps try the Chainsaws and Such forum down toward the bottom of the list from the Forums home page. There are a few saw builders/mechanics that hang out on there. They would know about converting the saw.