At first I too was confused. It appears that you are doing what is obvious - running tinplate equipment on 2-rail track, by merely insulating things. I have long advocated that step for folks who like 20" radius curves, giant couplers, and giant flanges, but who hate the center rail. I cannot figure out why that option has not got a huge following.
But getting insulated pizzacutter wheels is not going to be as easy as getting insulated 2- rail wheelsets.