mwarner, IMO if you are left eye dominant....get a lefty bow and learn to use it, and shoot with both eyes open. Chances are you will be much more effective in the long run.I know several guys that have switched to lefty over the years (after years of shooting r/h) and after the intial awkwardness of the change, arebetter, and glad they did.
You can shoot right handed/right eyed, but make sure your left eye is closed or it will probably try and take over and make you much less accurate.
As for crossbows...personally I don't like them and wish they hadn't legalized them in Va. But again, that's me....you do what you need to do for you, not anyone else.
Good luck