Damned if you didn't just ask a question I've been stewing upon for years. I wish I had something truly constructive to add to the thread, but I just thought I'd show my solidarity with your question.
You've probably heard of these places (most of them "off-shore" for dubious reasons) that offer "rapid-detox", which is exactly what it sounds like; A precipitated, faster withdrawal experience, often times whilst under General Anesthesia. So there must be some way of accelerating the process of withdrawal, whether or not the method includes use of common Opioid antagonists like Naloxone (Narcan) or Naltrexone (Vivitrol, Revia, Depade), I'm not sure of.
Either way, I really don't think that this sort of thing should be attempted by a lay person, even if they possess the necessary medications. While Opioid withdrawal, as we all know, is not typically lethal, there are statistical outliers, including people who have died of heart attacks, dehydration (vomiting, diarhhea) or what have you. Who knows how much more lethal Opioid withdrawal would become if it were amplified by the use of Opioid antagonists. It could be dangerous.