I can't get used to EVF, probably won't for a long time. I tried several RFs, including GX-1, G12, X100 and X10. none of them are useful for MF. While X100 and X10 claimed they have the first dual RF in the world, that's actually just a market gimmick.
The only acceptable optical finders for MF are still SLR and Leica M,..., and they are century old stuffs. Is it really that hard to make?
Have you looked at the Fuji X-pro1? While not a true 'rangefinder' the OVF on that camera is rangefinder style. Many are pleased with it.
However if you characterize the X100 viewfinder as a gimmick you will likely not be satisfied.
Leica makes fine cameras, why not get one of those?