[Max Lobovsky]

I can't seem to find any good pictures, but last year, I am proud to say, we had an extremely simple and effective ratchet design. We simply took a ratcheting socket wrench, cut fice slots in a large socket to mesh with the FP spool driving our winch, and bam, no more backdrive.

You could conceivably do the same thing, put a servo on the direction selecting switch on top of the wrench and control the direction it works in.