Tom - Bueller? Bueller? Funny.
Anyway, snowplow pilots on standard gauge, modern steamers were never common, so
far as I know, but were not unheard of, either. If you want to freelance a modern steamer
with a plow pilot (and it could look pretty cool), it would not be "wrong".
Don't reject the On3/On30 plows out of hand; they may be large enough for your
needs. They are "O scale", even if for narrow-gauge equipment - check proportions.
See below.
Also, the common plastic "diesel plow" would not look bad, and could easily be re-shaped
and customized with styrene and filler.
Western Pacific 2-6-6-2; no date, but a "modern" photo: