I am often confused by hydraulics! Since you haven't gotten much attention to this post, I thought I might throw an ideal out there that I had many years ago to add hydraulics to a non hydraulic tractor. I searched and found a Steiner (yes, lawnmower!) reel type mowing deck that had an onboard hydraulic pump to run the lift cylinder and the hydraulic motors that turned the reels. That hydraulic pump was powered by the front pto off the Steiner lawntractor but the pump was mounted on the mower deck.
So... find a similar belt driven pump, build a bracket and power it off the front pulley's of the engine. Just another thought, would be an automotive power steering pump, but I don't know that it would have the capacity to run the hydraulics of a tractor. Cheap to check, just a trip to your local salvage yard to grab a pump and try it.
Good luck, David from jax