This is an amazing project and level of effort, and I empathize deeply with this photographers desire for a clean, simple, beautiful camera.
I so deeply want a modern EVF camera, doesn’t even have to be a rangefinder, with a mechanically wound shutter so the film advance lever has a reason to exist.
I’m aware of the Epson R1 but 6MP is too low.
The Fuji X-Half has a wind lever.
https://shopusa.fujifilm-x.com/x-half-x-half/