No, if you're looking to inexpensively shoot digitally with M mount the Micro4/3rds standard is your only choice (The Panasonic G1 is the lone m4/3rds body right now).
If you find visoflex m-mount lenses (not noctilux, usually tele's) you can get a visoflex to EOS adapter (search ebay). Some minor deconstruction of the visoflex mount lenses is required but no machining.
The shortest is the 65mm f4 macro-elmar, followed by the 90/4 Elmar, 90/2.8 Elmarit and 90/2 Summicron - only the much older variants though, not the new APO summicron.
I looked at the distances, it is only possible with the rebel / X0D body style with small mirrors (1D's need not apply). This will require the removal of the EOS mount, machining the guts of the camera out, then epoxy / screwing a M mount in. This will not be cheap to do the NRE will be high, and you may need to sacrifice several Rebels before you get it right. I wish you the best of luck trajan in your opto mechanical engineering project.
