For them, there is the Contax S2. I say this as a user of Leica M series cameras who has seen generations of electronic gimmics go obsolete while I still get pictures with my double-stroke M3 and folding Summicron that fits in my pocket. O.K., they are even more expensive but IMHO worth their price. It is not as accurate, nor as fast, as an electronic shutter, but it does its job wihout battery power. I would really like to see such a photograph.
Electronic shutters are of no practical benefit for a camera without autoexposure.
Anyways this is a small problem and I hope to own this S2 for a long time. I have never regretted this, the S2 is a very reliable companion. And yes the lightmeter could be more sensitive, but as an experienced photographer I know the light-situations and use the meter only for contrast control. I opened the battery chamber, rubbed and warmed the silveroxyde cells and it went back to work only to stop again after a few minutes. I changed to a lithium cell to watch the same problem occur.