I just called Kenn Womack at Rolling Block Parts to order my cleaning rod. We talked about my sight problem and he mentioned that he used to own a rifle nearly identical to mine. It had a novel solution to correct the front sight height and allowed for correction of windage as well. The attachment fits over the original sight and is held in place with a set screw. It can be removed at any time with no damage to the original sight.
That sounds like a good idea. A very good idea indeed!