Yes. I don't do any movement either, but doing things like yawning, jaw movement may be a way to teach someone how to do it completely movement free. My guess is most people can do this but are unaware that they can. I would guess also that a very few really do have to use the other methods and move something to make it happen. Maybe the same % of the population who actually have such a medical problem that they really can't get vaccinated-- now, back to The Pub.
Yours is, I think, a great explanation and starting point for someone who doesn't understand how to equalize hands free. I'm going to try and teach my sister using your cues as a start and see if that makes it easier to pick up on.