Adding the subset in isn't all that hard and I am sure Amber can do it quite easily, but it will require the mesh being separated to do that.
I've already updated mine, since I keep my meshes saved with all parts separate. (As in I had already made my own shorter ones) The single tile I have must have been from her then.
I guess I personally would use HS single tile since it already has both parts. It's easier than separating sunnisims.