Just in case this helps someone else, Adderall has worked wonders for me to get off Oxy, in combination with clonidine as well. Clonidine alone took away the sweats, but I still felt like death warmed over and very, very tired. Adderall and Clonidine made me feel almost completely normal; the clonidine apparently knocked out the anxiety and speedy heart rate but the adderall I'm guessing boosted dopamine enough so that I wasn't tired or depressed. I still didn't feel 100%, but I definitely felt 85-90%.
I think the key is keeping the usage low -- only 7.5 to 15 mg of adderall if you have tolerance or 5 - 10 mg if you don't have tolerance to go along with 0.01 mg of Clonidine. It amazed me how much easier it made the whole process. And during tapering, this combo actually allowed me to go 10-12 hours between Oxy doses instead of 4 hours, and my tolerance/dependence tended to drop like crazy using that dosing interval. I went from 120 mg down to 40 in a matter of 7-10 days instead of weeks without feeling sick or having to stay in bed.
I doubt there have been any studies on this since I don't think anyone wants to be the one to say one incredibly addicting drug can help reduce an addiction to a different incredibly addicting drug but in my experience it works if done correctly. Just space your decreasing doses of oxycodone before and after the dose(s) of adderall (i.e. I'd take the oxy at 5:30 am when I get up, the adderall/clonidine at 9:30 am, and then I wouldn't need to dose oxy again until around 5:30 pm. The oxy tolerance dropped like a rock until a point where I was able to feel normal and good for extended times without Oxy. Probably the biggest factor in being able to maintain normalcy is it completely gets rid of that brain fog/lack of motivation that is so devastating during opiate withdrawal.
And if your plan is to get on Suboxone or Buprenorphine, this also worked to make the 24 hours before Sub induction much, much easier. The key in that scenario is dosing your last dose of Oxy in the morning, then the adderall twice earlier in the day, and in the evening using another dose of Clonidine to assist with sleep (that one night will probably be rough on sleep, but you'll get a little). Then the next morning start the Sub.