Maybe a 2-7X BPlex on a revolver. The 3-12 is not needed. Very few revolvers able to shoot far enough to make the 3-12 usable. Even fewer shooters to take advantage of the 3-12 on a revolver. Not a lot of revolvers accurate enough at very long ranges to make a 3-12 useful.
3-12 on a single shot is a whole different story. It's the best.
The Plexes on either of these would be tough to line up to make them useable on revolvers. The revolver rounds just don't shoot flat enough to make the plexes very useful. However, on singles shots, most of them shoot flat enough to make the plexes usable from 400-500 yds.
I still think the best revolver scope is the 2-6X Bushnell Elite. I've used mine on game out to 200 yds.