I found switching from my OC habit (being honest, i'd say 80-120mg a day, unfortunately) to Bupe to be the easiest thing I had ever done in my life. The withdrawal was pretty easy to deal with knowing I had infinite fixes on the other side (had cheap, easy access to Bupe without a script so no docs to satisfy). Also, because your not aiming for clean but rather switching drugs, I don't see the same issues with using drugs to get through the 24 hour period. Due to NDMA activity most dissociative do a solid job of masking w/d without interfering with the time you would take your Bupe.
Give it a shot, I ended up MUCH preferring the feeling of Bupe to OC. The long half life allowed me to be the most normal, yet 100% addicted, person in the world. I live and work with a bunch of shrinks (I am a shrink too) and they never noticed my Bupe habit. I never would have gotten this job (or my license) as an OC user. I found the energy Bupe gave me amazing, and in contrast to what others said, Bupe gets me high as a kite. No anxiety, limited "cares", numbed pain, euphoria. Better (for ME) then any aspect of OC other then the initial rush when you rail (or shoot) the substance while already high. I found the switch from Bupe to nothing impossible multiple times and was only recently able to switch to Kratom. But the difference between needing regular fixes to feel anything close to normal and being able to go about a day and a half without a dose is a major difference. The half life of Bupe means you almost never need to worry about taking your next (easy to get of course) dose. It allowed me to feel much less dependent on the substance.
and random personal note, 3 days off Bupe.