Probably not so much in 3-rail, where a lot of people are collectors and seem to like to keep things original.
It is much common to do this in 2 rail O scale and there are custom builders around who could do this. Rod Miller is one custom builder that could do this with a brass model. www.rodmiller.com This reference is a few years old, I hope it is still good.
Is is much harder to rework diecast bodies than brass ones.