Oh don't worry about thread hijacks. It's great to see another.
I couldn't find a stock picture of the hydraulic pto.
You have done well to get those bits so cheap. You could try and find a bottom pto for the hydralic pump and then a rear pto for the capstan and mount it on the back. Does your winch still have it clutch leaver for free running the drum?
I've seen 1 drum winch with a warping drum on the end, awesome thing.