If you are needing that much hydromorphone to deal with your pain, there is no possible way that any amount of bupe will provide that much relief.
To me it sounds like they are trying to taper you off. I can't think of any other reason that they would prescribe that.
I have never heard of any doctor doing this, but again I'm not a doctor.
A doctor put my friend on the bupe patch along with hydro so it does happen. I dont think alot of doctors know how bupe works actually