Very good chance that the vane seals are not leaking but wore out makes a very good point. Now keep in mind that I do not always replace everything when I replace seals in a pedestal mostly because the whole kit is NLA and very hard to find as well as pricey. Last I checked, a couple years ago you could still get individual parts from the kit at your local dealer. I would be tempted to do as you are thinking just because those vane seals have to be the most difficult part of rebuilding the pedestal.
Just completed adding PS to my high seat 60 std. Although I did completely rebuild the pedestal some other (sleeping dogs) things were not touched. So far so good as I am satisfied with how the PS operates.