I do have a quasi screen door that I have rigged up for Billie's safe room. Last night when I got home from work I fed Harley (he insists it happen the minute we walk in the door) and then went to pet/feed Billie. Once I got the feeding over, mail read, clothes changed, etc. I set up Billie's screen door so she could see/smell the goings on while Harley roamed, we ate dinner, did dishes.
When we (myself, my husband, and Harley) were settled in the living room I went to go let Billie out but instead of just letting her run free I put her in a harness with a leash attached. Yes, it was a bit of a game/wrestling match trying to get her into the rig but once accomplished she was pretty much OK with it. Of course, the leash became a toy but we managed to get down the hall and Billie roamed the kitchen/living area for while in a much more subdued manner than her normal procedure.
Harley was settled next to my husband on the couch while Billie was exploring. I pretty much kept her attention away from him. I eventually picked Billie up and set her next to me on the love seat, forcing her to lay down while I kept petting her. She could see Harley but wasn't really all that interested (for the most part) in hopping down to go visit. Eventually Billie jumped on the back of the love seat (to assume a position higher than Harley I presume?) and just laid there. After about an hour I put Billie back in her safe room.
My husband left Harley on the couch and went to Billie's safe room to give her some attention while I did some chores. After about 10 min. he let Billie run free and she "calmly" explored the house while only passing Harley on the couch once. Harley hissed, my husband grabbed a pillow and held it between the two cats. Billie left and resumed her exploring in the basement. When she came back up about 20 min. later she did a loop of the living room passing Harley (with no hissing) and calmly walked back down the hall to her room and began eating. I followed her...gave her a pet, said goodnight, took down the screen door and closed the other door.
Any thoughts on the harness experiment? It sure seemed to mellow her out even after it was removed. Since it worked so well last night I think I'll do it again tonight