I watched some of Jason's video, but the ideas are a bit fuzzy. Carl, in a few simple words, what is the problem?
With a little skill and understanding, removing and mounting motors is not difficult. The bigger motor, the common multispeed one, not the CP one, has a larger mounting flange that fits over the original one.
The 9 pin canon connector is a bit fragile, given that non trained people remove and mount the motors. They only cost about USD25, but can take a few hours to swap out. I think any good camera tech who likes to solder can do it.
The story I have, and I don't know if it is true, is that Andrew at AZSpectrum is the only one who knows how to work in depth on the motor electronics...http://www.az-spectrum.com/ He can be quite generous with advise if approached well. Finer points of mounting motors and so forth.
A year or so ago Visual products had plenty of the 9 pin canon connectors.