We've let a RHD R32 run in SSM locally, too seems wholly appropriate for the car even if it's technically excluded because it wasn't sold in the US. If you're looking for an exception for literal imports that were never sold in the US, well, that's unlikely to happen. Most popular imports that are sold in the US are already classed at every prep level.
Heritage classic (new this year) is similar to CAM for imports and could potentially be expanded if it turns out to be popular enough. Are you talking primarily late model imports, like cars with random misc mods that don't fit cleanly in the existing prep structure? http://cdn.growassets.net/user_file...1455893947