I would just buy another pair for the lens. The Grey comes in the majority and I still see Polished black in most OPDs. Why risk an improper base curve for the frame. Amateur Athlete in Bethlehem had a pair still when I was there a few weeks back. Take a ride up and save some headache.
I can tell you this: You won't get a headache, or shouldn't from my chops. I have heard of others having them tested at the rolling o lab and coming out with as good as, and once I heard better than factory cut eyewear off the head of a rep that was tested at the same time. Warm Grey is not a standard either I don't think...I can cut most lenses to fit, and try to use something that has a close if not same curve to prevent that.