For opiates though, I'm not aware of any full agonists not blocked by a suitable partial agonist (obviously affinity is a big issue, but o-desmethyltramadol has a high affinity) so it seems that there is significant overlap for all known mu agonists and antagonists aside from the *inorin's. Tramadol itself has negligible affinity, and the m1 metabolite is mostly or entirely responsible for the opioid effects. I honestly don't know if tramadol itself is a partial agonist, but it seems unlikely.
Oh wait, I'm thinking about the kappa receptor in that *inorin bit. I know salvinorin is not entirely blocked by buprenorpine (a kappa antagoist), at least with a high enough dose (8mg dose, taken ~18-20 hours previous only partially blocked a 5mg smoked salvinorin a dose. The measurement is not 100%, there may be a 1/2mg off +/- , from my 20mg/ml solution- if you weren't on suboxone, it'd be difficult to measure that solution well enough.
IGNVS: I'm not aware of any opiates making 'false receptors'- some types of tumors, yes, but not opiates. It'd be an intresting concept, but AFAIK, it's false. There are some studies indicating that receptor proliferation may be involved in tolerance, but theres a lot more to it that that.
And re: "one that dosnt [sic] fuck with your neurochemistry so that you dont get w/d's'
You can't take a drug that doesn't mess with your neurochemistry. Taking a psychoactive drug means messing with your neurochemistry, that's sort of the definition, you know?
There are some opiates that bind to the ORL receptors that produce less or no tolerance. I think bromidol and methydol are both strong ORL agonists (or is it antagonists you want here? I forget!!)