Not that my opinion is right, but seriously, why would you do this? I know some people can't drink without vomiting, but same goes for opiates. By far, alcohol is more intense. I've had IV morphine, insufflated oxycontin, oral oxycontin, oral hydrocodone, and oral codeine. None of which compare in the intensity of a good alcohol buzz, even before the point of vomiting. Hangovers suck, but are avoidable, and I'm sure opiate withdrawal sucks more.
I don't do either of these drugs anymore. But from what I remember, I never really had opiate cravings until I stopped drinking alcohol, because I loved it so much more.
Not to say mixing the two, or throwing a benzo in there isn't fun...just don't mix vicodin or anything with acetaminophen in them...
Edit: I was saying opiate withdrawals suck more than hangovers. I'm not an idiot. I know alcohol withdrawals are worse. Sorry for the confusion.