Oh nos! I couldn't imagine trading in my pole for anything but another x-pole...
When you say "vaulted", do you mean like a cathedral ceiling that goes up to a point in the center, or an actual vaulted ceiling meaning it's just one giant angled ceiling in one direction??? I've heard people use both interchangeably so I get confused easily...
I'm not sure if you can do this if you rent... But with either ceiling, do you know someone that is like a contractor, or something like that? (a.k.a. someone that knows what they're doing?) I've heard of people making wedges on the ceiling so it creates a flat surface for the pole. If you had a cathedral ceiling, you could put it dead center on the peak and actually make a triangle-type shape that would be easier to make sturdy compared to a wedge against just one section of the vaulted ceiling (that's why I asked which it is... 😀)
I know it's probably not recommended to do this, but as long as you use solid, thick wood to make the wedge (as in, not particle board!), put it spanning over 2 joists in the ceiling, and for the frame on the inside of the wedge, use multiple mini-joists , there's no reason why it wouldn't hold solid. Oh, and it would have to be crazy well screwed into the ceiling. Use large, aggressively-threaded screws going into the joists - no dinky finishing nails toenailed into the dry wall. Another thing that might help is if you can get into the attic above where you want to put the pole and reinforce the joists.
Like I said, dunno if you can do that as a renter... 🙄 Good luck and maybe some of the other girls would have some ideas for you!