I wonder if a trailer spindle and hub would work? Shouldn’t take too much fab work. Take out the lugs, weld a 3" or 4" round x 6" length of steel pipe on the hub, and then weld a piece of steel plate on the top of the pipe to bolt reel too. Spindle would be welded to the pull out frame. Might have to put stops on each side so it doesn’t turn too far each way.
I know you don’t plan on doing it and I don’t either but just brainstorming.