Of the photography-related crowdfunding projects out there, this is one I wouldn't support as I would't want anything other than film in my film cameras. I'm not anti-digital at all, however, I like to keep some degree of separation rather than trying to multi-purpose things.
I don't know if anyone remembers (or had one) but, in 2005, Leica released the "Digital Modul R" (DMR) for their R8 and R9 cameras. This was a replacement back system and it worked pretty well. I never found out how much one would cost as I would have needed to switch systems entirely to be able to achieve something that I could do by simply buying a Nikon DSLR to supplement my film cameras and lenses.
Hasselblad V-series cameras also take digital backs and, if I was ever to want a multi-purpose rig, I'd probably go down this route as, down the years, I've er.... "invested" in their gear and, were film ever to go out of production altogether, I could still get to use it.