Agreed on the guess bit. That is why I'm looking for specs. I like to have, at the very least, an educated guess.
Simplest would of course be to run a manual with PTO, auto is just a convenience, the "HTO", shall we call it, is just an interesting proposition. It would of course require more research on what HP motor would be needed, flow of the PS pump or other pump, etc. More theory crafting.