I'd hope for a thicker laptop frame, then. I think a frame thick enough for PCB + Chocs would then allow both a premium mechanical keyboard in a standard shape

I'd hope for a thicker laptop frame, then. I think a frame thick enough for PCB + Chocs would then allow both a premium mechanical keyboard in a standard shape, as well as allowing for swapping this out for whatever more niche arrangements. Whereas, for a thin, non-mechanical keyboard, the manufacturing cost would be too high to be feasible for anything but standard, presumably.