Has anyone ever tried using an pump (like a small aquarium pump) in the IPA to help with the agitation when rinsing a print?
I have not but I use a stir plate. I put the stir bar in a beaker with a metallic grill on top to avoid contact with my parts. This works great in helping removing residual resin from them by agitating the IPA.
A magnetic stir bar is probably going to be the best mechanism for this as far as safety and ease of implementation goes. Pumping IPA can be a bit precarious and Form Wash is setup to use a magnetic stir bar in the bottom of the wash container.