Yes, I think that it would be better to just avoid stairs whenever possible during Thule's recovery.
I can totally sympathize with not sleeping in your own bed for months. I could not allow Hazel into the bedroom at all because she would've jumped up onto the bed. So for the first part, I slept on the floor of the computer room where we were keeping her confined, and after we moved her into the living room then I at least got to sleep on the couch. But, like Thule, Hazel never would've slept if we'd have tried to make her stay by herself in another room. In fact she'd have likely jumped the couch and come into the bedroom anyway.
I'm sure you realize that newfs are especially sensitive, and the worst punishment imagineable for them is to be seperated from their people.
Livin in a Newfie Drool Zone