rear station installation

Hmmm. You may want to tell us what kind of engine controls you have, what kind of engines, how many stations you already have etc

You should be able to add another set of Hynautic controls, running the howes will be the hardest part of the job depending on the boat

Also, new manifolds at the connect point. Look where all the controls come together. Usually close to the pressure / receiver (where the air gauge is).
You should find some alloy blocks where all the controls meet. Is there a path blocked with plugs for expansion?
Send in pictures of the manifolds if not sure.
Nerve racking could be running the fluid tubes. It's black plastic tubing, 5/16" od. Two per control. So 8 tubes, 1 1/2" bundle. Punch 2" holes with an anti chafe ring at every pass thru.
Up thru the bilge is O K if you must take that route.

I do prefer the ole Hynautic controls over cables and drive by wire (electronic controls).

However, the drive by wire is getting better, still not lightning proof.
But the drive by wire needs to be considered. Has lots of extras as idle speed and electronic clutch slippage management.
Oh, zero effort lever operation, Electronic sync and one lever operation.

I bring all this mess up; The remote Hynautic controls and all misc hardware that your asking about will equal a notable part of an electronic system budget.

Oh
Instead of a steering pump back there, An A P jog control will move your rudders,,,,, by wire.