comments:
So, obviously I'm the OP and don't have a solution yet, but when I got my boy cat I kept him in my bedroom with the door shut then at night he would go to my master bath (it sucked!) and the cats would come in my room without seeing him. Eventually I got this after a week or two: https://a.co/d/0hQfTqwM I could keep him in my room with the door open but made sure he had places to go so they couldn't see him if he needed time. This let them slowly see each other. Then I used controlled meeting with a king size pillow to block view if anyone got rambunctious. Did an hour a week then 2 the next week then full roam the 3rd week and even though there was chasing, it did work. They ended up getting along after a few months. My situation now is different but hope that helps.