I don't know why you started your post with the SMIY acro Bella but we don't use them for any reasons on this board. Read the Bluelight User Agreement here...
http://wiki.bluelight.org/index.php/Bluelight_User_Agreement_(BLUA)
...and by using and following the advice and information in that, in combination with the anonymity of your user account name and by generalising the content of your posts you should be able to able to discuss issues such as this without fear of incrimination or reprisal.
As for the rest of your post, yes, by the controlled and reducing use of oxycodone prior to a sudden cessation of opiate / opioid use - you
may reduce the severity of the physical withdrawal symptoms caused by your heroin dependency, but this may ultimately be of little help or comfort when you do finally face the music as subjectively heroin withdrawal can be intolerable following all levels of dependency, as the mental aspects of the w/d syndrome or any subsequent PAWS that you may experience will not be affected by this approach, and when you are in the moment and are in physical discomfort due to heroin w/d symptoms, you may not be in the position to appreciate that you are in 30% less pain than you would be otherwise, that you only have 15 loose bowel movements over a 24 hour period instead of 30, that you are only conscious of the sensation of RLS for 12 hours a day instead of 18 etc etc. It is obviously best that you cease your use on the lowest dose possible if you are going to attempt a CT - but heroin withdrawal sucks bigtime regardless of how much you were taking and the mere fact that you may have managed to reduce the severity of the physical discomfort prior to the symptoms appearing may ultimately be irrelevant come the time due to other internal and external factors around you.
It's a common position for a heroin dependent person to be in, and with only 2 years of dependency under your belt you may have not been around the block enough times to accept that most of the problems that heroin causes are just flat facts and that there are no ways once you have become addicted to get around or avoid any of the major obstacles that face most of us once we decide that we actually want to get clean, which is in itself a transient concept as I would expect that many users do 'want' to get clean, but DON'T want to stop using. That's me in a nutshell anyway.
If you do want to stop using, apart from going 'cold turkey' the only other real option is to accept a prescription for a substitute opiate and then use that to either maintain your addiction while you reduce the rest of the chaos in your life that heroin addiction causes (most importantly they help break that cycle of raising money, scoring, waking up sick as a dog back at square one so you have to raise money and ad infinitum).
I avoided a methadone prescription through 10 years of cycling through heroin addiction until my home circumstances became so demanding I did not have the space, time or peace to manage a cold turkey (something I have done successfully on many occasions, so well that I have in fact relapsed immediately on about half the occasions from celebrating my freedom by smoking / shooting a bag or 6) but after 18 months of maintenance on a 'therapeutic' dose, I managed to finally break the entrenched behavioural cycle I have described above, and am now on a 5ml/ month reduction that should see me in a position to swap onto buprenorphine at a low dose in the autumn, after which I have the chance at gaining a place at residential rehabilitation service that claims that they will be able to detox me from the bupe in 2-4 weeks in their inpatient detox unit prior to the start of a 14 week CBT based rehab course that is my last chance to 're - wire' my brain, as I love drugs but they have and continue to impede my progress in anything else in life, and as much as I would just love to sit here and rot I still have a few miles left on the clock that does not make this a tenable option. If you are already addicted to heroin, by accepting a substitute prescription, you are not swapping one addiction for another, you are just swapping the drug that is to maintain it from one that is inconsistent in strength, effect and safety and that you have to chaotically prioritise things to obtain, to one that has very little of these problems and is, to patients in the UK, free (EDIT: at the point of supply anyway).
Unfortunately, you appear to live on the land of the free, where unlike us commies, one has to pay for everything including the right to be well and happy so unfortunately I cannot be of any more help with regards to the U.S. specificities of drug dependency treatment, but there are forums on Bluelight that do, such as our counterparts in the North and South American Social and Drug Discussion Forum that can be found here..
http://http://www.bluelight.org/vb/forums/138-North-amp-South-American-Social-amp-Drug-Discussion
...or for more specific advice surrounding heroin addiction and treatment, please have a read and / or post on our 'Other Drugs' board
, and most importantly, the same applies to the to sub - forums that make up our 'Recovery Support' section, which are all here
http://www.bluelight.org/vb/forums/268-Recovery-Support