If you want to stay with iron sights. The only thing that comes to mind is a front bead on a ventilated rib. I had this set up years ago on my Remington 1100, it worked great for trap, skeet, and upland hunting. I didn't do any waterfowl
hunting. It will do for turkey, and it is accurate enough to use to shoot deer with slugs, but you shouldn't expect great
accuracy, past 50 yards, with this type sighting system. After all it is a compromise type set up.
I wouldn't get regular iron type rifle sights. To me it would be a distraction when wing shooting. Just a personal preference.