It would be quite easy to design a bolt-on gear driven hydraulic pump to replace the original. A plate and some plumbing driven just as the belt pulley (of course with the disadvantage of being still connected to PTO running requirement). Not so easy to duplicate the hold valve and synchronized control of the hydraulic cylinders and the timing/delay circuit (all doable). But with the advantage of everything being routed externally, so you have more options for creating your control/spool system. Not that I'm going to do this (I'm about tapped out), but has anything like this ever been done? Or only front end pulley, distributor driven or pto/belt driventhe only thing you've seen? I think there's actually enough room in the housing to implement a separate (manual or electric) PTO clutch. Kind of the reverse of current, hydraulic pump must be on for PTO to work. There's actually some quite compact, robust category 1 PTO clutches available.
Just a discussion topic, theorizing, no need for meanness.
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