You're not likely to get high from Buprenorphine (Suboxone), given your history and current level of usage. It just really doesn't work like that. You will find people using Buprenorphine recreationally who have previously not been dependent upon Opioids for sure. It's also not out of the question for someone with a previous dependency to get a buzz from Buprenorphine following a long period of abstinence, but it's not likely that you're going to have such an experience given what is a fairly signifcicant, regular intake of potent Opioids like Oxycodone.
Buprenorphine for you would be best used as a stop-gap solution for when your stock fluctuates unexpectedly or to help you taper from Opioids completely. At any rate, you absolutely don't want to take Buprenorphine prior to experiencing significant withdrawal symptoms from the Oxycodone. For most people, this means at least a full 24 hours and maybe more. I have gradually moved away from trying to provide people with objective timetables for inducting with Buprenorphine. I think it serves people much better to just say, "listen to your body". Your body is going to tell you what's up.
Everyone is different in terms of the symptoms they experience in withdrawal. You know best what withdrawal means to you. For this MA RT. 128 junkie, withdrawal means a gradual increase in anxiety and a gradual return to sensing the world around me in relation to the numbness of Opioid intoxication. Then the restlessness, then the yawning, then the tears, then the vomiting. The vomiting would be my indication that I could probably administer a little bit of Buprenorphine.
Like you've said in your original post OP, you should definitely start with a small piece of the strip. The smaller the better. Put it under your tongue and wait 30 minutes. See how you feel. Do you feel better or worse? If it's the former, then you can continue taking pieces of the strip. 12mg is a relatively strong dosage, so, small pieces.
SKL, I dig your avatar. It's badass, except you accidentally put a Yankees logo inside the steal your face, where there should be a Red Sox logo. We all make mistakes.