I'm pretty darn sure you won't get enough power from the LED source off the pcb to run your winch. I think your best bet would be to incorporate a ZZ/bit board and build one from there.

I've had ZZMT boards handle 4.8 volts, but haven't has as much luck with zz/bit boards. You'd need to voltage regulate it or find your own power source. You could use a ZZ se battery, it would be really light and should provide ample power for a few good pulls.