Ok. I'm with you so far. That's all down-to-earth, conventional physics. Even if the mechanism is not involved in olfaction, it may still be found elsewhere.Yes, that is correct. So a heavy hydrogen molecule will have a different resonance compared to a regular hydrogen molecule, and this supposedly can alter the perception of smell, even though chemically they are identical.
What I don't understand is how this relates to your ideas. In particular 2. seems not at all down-to-earth nor conventional. And there's more I don't get.