Metro
IMO, you should switch to l/h, and learn to shoot that way with both eyes open. Yes it will be awkward for a while, but once you overcome that, I think you will be better overall. I know several guys that are just like you described yourself. They made the switch to l/h after years of shooting r/h, and are happy they did. Overall it feels much more natural,they don't have to fight the eye dominance thing, and seem to be much more accurate overall (with less practice).

Data...yes maybe you can do it, but more than likely the avg guy out there can't do it nearly that well. Another thing, if you can LEARN to shoot cross dominant well, you can LEARN to shoot lefty well, and probably with less trouble. Asking if Howard Hill and such could be better...maybe you are right, but how do you know they couldn't? And 99% of us couldn't be as good as that no matter what we did, so thats not really a valid question.