Too bad we are so far away, I would take a young white leghorn that is already laying. I have this vision of a small flock in which each hen lays a different color egg, so it would be easy to know who's is who's. The other advantage is your leghorn is people friendly, and I have heard that...
Hi savingpurple,
If the above methods don't work, then consider rehoming your leghorn. A now healthy 17 week old leghorn that is laying could be a great addition to someone's flock. If you explain the dominant behavior to any potential buyer/adopter, then they wouldn't be blindsided at all...