Thank for your reply.
Part 2: The WM.conversion leaves me with a scarred 30 inch vent rib barrel.
On another skills for work trade I can get the barrel lathe cut and threaded for chokes.The gun would be cut at the vertical base closest to 18 inches,probably about 18-1/2 to 19 inches. Choked for cylinder or IC I have a good defense or short barrel smoothbore slug gun,add a 4 to 6 inch
extended turkey choke or straight bore tube to quick change back to a mid length field gun,rib mounted high-viz sights for faster old eyes and a grooved receiver mounted rail for red dot or scope. The goods have been located or already in hand and the cost is less than a cantilever barrel.
My small frame likes shorter length barrels (24-28 inches)and versatility is the key.
I would be grateful for any useful input, opinions or ideas. Clearly shotguns are not my main forte but I think I grasp what is wanted and needed.