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Now that you mention it I've seen something similar. I was a self contained motor unit that fit over the window crank post. The application I used to see it was in the late 70's through late 80's conversion vans (back before electric wondows were an option in vans)
Bobby
Bobby whenever you want to find something you have check uPay, 9 times out of 10 you'll find it there:
I think it would be very easy to make your own. All it would take is a couple of micro switches mounted on a modified stock crank. Cut all of the mechanicals from the around the crank, weld a couple of small brackets and mount the switches. Also on the Two Guys episode they mentioned the kit have a relay circuit with a swith under the dash that is flipped so the driver's side handle could be used to lower the passenger side window.
If you used micro switches you'd need to use relays as well, you could use momentary contact push button switches tho that would handle the current so they could be direct wired and would be more durable at the same time.