Wasabi, I have a hook made from alum. conduit that I have used on the Ben Harrison bridge. That was before security got tight about tie to major bridges. I would anchor up stream, drift back and toss it over the wooden bumper, then shorten up my front anchor rope to pull the back rope tight. Kept me very steady even with all the boat wakes goint by.
Anyway, I got a single stick of alum. conduit. It is threaded on each end. I bent it so the threads were on the end of the straight shank. Then I screwed on a union. Drilled a hole in the union to accept a carabiner. Tie rope to carabiner. If you size it right , you can free/lift the hook by inserting the handle of your landing net.
You don't need the union. Just drill thru the conduit and pass a rope. I just used the beaner as a quick disconnect.
Dayton