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The downside of mounting a motor controller on your existing focusser is that you'll still have the sloppy mechanics and backlash of a cheap R&P. You also have a dangling chord and hand controller to accommodate. A Crayford with 10:1 fine control is a lot simpler and IMO nicer to use. The fine control knob only requires very light touch that is unlikely to excessively shake the mount. (If it does then even a light breeze will make your scope unusable at mid to high powers and you really need to upgrade the mount.)
But either solution will work. If you want the cheapest option, the motor focusser is probably it.
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