Was looking around on Surplus Center, and they have some PTO driven winches you could setup to run off an electric motor, would just need a motor and cable then.  I see they only want 1000 rpm going in so may need to do some belt/pulley setup to get the speed right, but it has plenty of drum to run whatever size cable you want.  You can get fairly long remnant bulk cable from FarmTek pretty reasonable sometimes wouldn't hurt to check what they have or you can get whatever length cut from them too.

Not to take away from your winch idea but what about something like this?  If you are handy with a welder you could probably make one yourself, could get real fancy and fix up from an old battery/electric pallet jack so is self powered then could use a 12v winch to draw them on.  Would take up a bit more room when just recharging/not using, than just a winch on a wall.  Guessing this is going to be a one building thing since you were going to use a 120v setup.  Just a thought... Like stated before, should be able to take any winch that has larger cable, take it off and put smaller dia. on to get more distance.