While I “get” the idea of altering something just to see if it can be done, motorising a rotary plow seems to me to be more in the vein of a giraffe car, unless you have some sort of Woodland Scenics “snow” to clear from your tracks.
I altered an Athearn plow to be auctioned-off for a fund-raiser, but opted to only detail it. No motor was added, although it could have been easily done.
Wayne