Suddenly got this idea, and I guess it will not be too hard to execute since the adjustment knob is pretty easy to turn, and therefore, frictional drive should work and no gear matching job will be required.
After motorizing the focuser of my C5, I still have another small motor left and I guess that I could use that one. Time to try it out!
Everything originated from the fact that I'm now using my Ranger again, since it's longer and adjusting the Tmax becomes a little bit harder than before when I was using a tiny Borg 45ED II. A great Tmax position could really affect that imaging result.