(I don't have any feeders at my place, so this advice is just from reading this thread.)
If I was utilizing the hanging feeders, I would put them on a long horizontal "swing pole". Could do that off of the end post of your dock. See how far the feeder throws from X feet above the water. Then size the pole length so it throws feed just short of the edge of the dock.
Just rotate the pole onto the dock when you need to refill.
Same thing might work for your shore feeders. Much easier to set one post on dry land, rather than set posts out in the pond below the water level.
The smallest typical oilfield pipe is usually dirt cheap. You could drill a hole in the pipe and put a piece of rebar in the post to make your pivot. That will be very practical, but maybe too ugly on the dock. Maybe paint it your favorite colors?
The swing pole could also be used to attach a camera to observe feedings, etc.
