Since you mentioned sturdy, I would pass on everything you mentioned on your list and go with a Trijicon Tenmile, or even better with 15x on the top end, the Maven RS1.2
I feel like this doesn’t actually solve a problem? I thought the height over bore line is mainly for a mechanical advantage. With this, the recoil flow is still the same, and your going to have that upward moment from the muzzle because it is still higher than the highest point on the recoil pad?