I like the K.I.S.S method for shotguns but, for the OP's issue maybe not. Think about this...... maybe, mount one of those 45* pict rails on the receiver facing to the left. Then, mount a mini red dot or something similar to it. When you shoulder the weapon right handed, the red dot "might" (I have never tried it) line up with your left eye. Make sense?
For example.....
http://www.amazon.com/TMS-Tactical-D.../dp/B0081LP992