I want to know how about if u use a excluder with the edges cut off and it fits just in the middle but it will leave enough room for the workers to pass and not the queen by she would come up between the frames in the middle she would then bump into the excluder not on the outside edges.
I put an excluder on once sideway, that is, with the long sides going across the hive from side to side instead of from front to back. The bees went to work on the super okay, but even after they drew some comb out, they quit working it once I spun the excluder around the correct way. I've also seen suggestions that a flat sheet of plastic smaller than the box's cross section can be laid atop the brood chamber to keep the queen down. Never tried this, though.