It could be done, but it isn't the best method. There are others just as easy to accomplish.
The MFJ possibly could be motorized, but by the time you got through, you would have spend more than buying a motorized one in the beginning.
If you want something dirt cheap (in the interim), then look around for a used Hamstick, or make one yourself. Certainly not as good as a HiQ, but even brand new they're about $25.