Duofold RF
Well-known
I'm happy with the look alike EVF clone neo-classic cameras like the X-Pro3 and X-E4 cameras. They look like rangefinders, they’re much cheaper in price, good quality construction, and they can use old manual focus M-mount lenses and new computer chipped manual focus lenses (thank you Cosina).
Can you use your connection in Japan to ask them to make RRF special digital rangefinder? Fuji would be the best source, they have all components, including software et al. just need to replace a crop sensor with full frame on and change the mount, then all done. You can facillate sell in here or eBay, If price is right will be a hot sell.
All the best Donald