Agreed this is a good opportunity for a major player to jump in. Maybe Schumacher? Their GT12 cars are popular across the pond and they have been on a buying spree with the tire side of things (distributors and buying out tire companies).
Prices for Schumacher Contact brand tires are very reasonable too as the manufacturer. Considering the mold is simple and no foam inserts, the only slightly different part is the mounting and glue.
34 GT12 entries out of 301 for Snowbirds so far.