There's no reason to limit your thinking to 'full frame' 35mm sensors.
A tilt shift adapter could be made to use Canon EF lenses on Canon M bodies. That would be easiest and have most chance of success as it would be Canon body communicating with Canon lens.
The tilt and shift range would be more limited compared to current TS-E lenses but some range beats none.
This would be a full featured adaption, AF, Aperture, IS.
A similar adapter made for Micro Four Thirds bodies would allow more Tilt and Shift range.
Using an older Tele lens such as Pentax 400 f4 6X7 could be adapted to Full frame 35mm allowing much larger Tilt Shift range.
Very true.
One problem, however, is that lenses for MF systems tend to be less sharp than lenses for smaller systems. I have no idea currently what the resolution of those lenses would be, so it is a matter of trial and error.
As to MFT: I do own two speedboosters and an adapter for EF lenses, so in principle I could experiment with MFT already. 
Kind regards, Wim

