I'm skeptical about low dose naltrexone as a means of potentiating opioids or rather what it's supposed to do, i.e. feeling normal and not feeling urge to take heroin or some other opioid agonist. I don't really believe naltrexone begins acting as a partial agonist on MOR after some time of use. It's no secret the body needs to get used to a new situation when an agonist is stopped. When you deliver something acting on opioid system from the outside, it's normal the body doesn't "feel" the need to produce endorphins, enkephalins, or dynorphins and it doesn't start to produce enough of them after discontinuation of the habit right away.
Anyway, isn't naltrexone therapy expensive? Be it in rapid detox or as a blocker after detox (at least it is in Poland but it's caused by the fact naltrexone isn't synthesized by any Polish pharmaceutical company and it doesn't figure on the National Health Fund list, you can't buy it at the drugstore, one must import it from abroad).