I think it would be so beneficial to have the ability to select multiple bp nodes that are the same and when you drag off one pin, it drags the same pin off the other nodes as well.
I like the idea of a solution to your screenshot, as I have had screens like yours, its tedious. It should probably be filtered so maybe only when you hold the shift key perhaps, and certainly only affect selected nodes. I think with those filters it could be any pin of a matching type on selected nodes, not just duplicate bp nodes.