My wife is cross dominant, she shoots Isosolese (spell that how you like, I did). Right handed with the gun centered under the nose, the dominant eye picks it up automatically. She shoots long guns left handed, left eyed. My wife finds it easy to switch to Weaver style with her head tucked down to line up her left eye. When she shoots while moving she sometimes does that without thinking about it until I point it out to her. Any decent instructor could teach it. It's not that hard to do.