Just some thoughts. I'm quite new at this, yet I have a good many Russian cameras now. They rapidly become a disease. I think the search for the "perfect" one is a treasure hunt that never ends. Unless you are caught up in the hunt like the rest of us and really just want the best camera for the money you are probably foolish to mess with these 50 year old cameras. They are crude, take only marginal pictures for the most part, like you've observed, don't have light meters, and generally are an end in themselves, with true photography lost somewhere along the way.
Here is what I think is the best route for a quality rangefinder camera, a Bessa R series. I have the R4 since I use mostly short to normal lenses. The camera is reasonably inexpensive, I got mine with a lens from a seller in these forums for about the price of a fairly extensive Russian camera hunt. The Bessa is everything you could ever hope for in an affordable rangefinder camera, wonderfully made, light weight, has great lenses and access to the best lenses made, has probably the best viewfinder in history. In short, if it had Leica written on it, it would be a hands down rangefinder winner. It is all together as good a camera as most of the Leica's out there from everything I read.