This would be my suggestion: something with the guts of an existing camera, with either a fixed 50/1.4 or 40/1.4, 35/1.4, or, an RF mount with such a lens.
As an intro special deal, they could refuse to sell the lens separately, and "make" you buy one even if you just want the lens.
There have been such cameras in the past: super-high quality fixed-lens rangefinders. Leica's made it's share of digital and film, Nikon had the 35Ti and 28Ti. It'd also be similar to the Contax G lineup, which I personally owned and loved, it being my always-in-the-backpack camera from like 1999 to 2002. If they went the G2 route, they could then introduce what I've long felt was missing: tiny, high-quality, "street photography" lenses that don't emphasize spec. Like a 35/2.8, 28/2.8, 24/2.8, 90/2.8? They wouldn't have macro and maybe not control dials, but simply be super high image quality and super durable.
This is their fixed-lens rangefinder QL14 (50/1.4) and they also had a 50/1.7 model the QL17.