Hey BP, reviving this ultra old thread because I was asking myself the same question today. Long time lurker of the forums but never had even created an account, decided to do so to now.
I am certain that having the ability to approach the ball with your target-side eye (regardless of lefty/righty) can promote/enable some good things for you - getting a better feel of hitting from the inside is, in my view, one of them.
Did you give this one a shot? and by a shot, I mean a proper go with at least a few range sessions hitting w/ an eyepatch. Eager to know if you tried it out and hear your experience.
I'm going to buy one later today and take it to my practice session tomorrow, should prove to be an interesting exercise.