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I've seen how effective the method is and never tried it myself... I'd be too afraid of the look I'd get if I failed... or flopped.
Ah, but Ziggy, that's the beauty part - you can't fail. Much of the point of the framing "handshake" is to provide social cover.
The main effective part, as you say, is to interrupt the spontaneous flow of the mind-stuff, if only mometarily (in a non-threatening way, if your goal is to continue the "communication" from there). But yes, we are mammals, so touch contributes to interaction.
If you find grossly interrupting the handshake too risky socially, then do the opposite: prolong it by a beat or two "too long " I know one person who exploits the social convention that the handshake can politely continue so long as phatic conversation continues, too.
So just ask a slightly unusual, but undemanding, question. "Have you ever been to a Yankees game?" will do nicely in the United States.
The best "story value" version I encountered was discovered by a guy by accident - literally by accident, he injured his right wrist. He had to wear a sling, so, he had "social cover" to offer his left hand. Just that much, and the magic was afoot. (So, invest a few bucks in a sling, and rule the world.)
Don't expect too much from a momentary interruption. Truly relaxed states take several minutes to kick in. You are up against physiology here, circulating regulatory chemicals and such. There is no shortcut, no "instant trances," sorry.
But it is fairly straightforward to convey the impression that you are the cause of the person's momentary confusion, and, crucially, the impression that you do not share in their confusion. This furnishes a reason for them to pay attention to you... and you're in.
Breaking through the "social armor" and routine "automaticity" is a genuine achievement. It is not, however, in any sense a substitution of your will for theirs. I am unsure, then, why Edward Alexander expresses remorse for doing that much, but I do think better of him for being concerned about such things.
And you do realize that there are schoolchildren who can do all of this, right? And that it was old news in the Third Millennium BCE?
What takes stones, imo, is not to do it, but to package it up in cutesy pseudo-scientific language that hints at more being there than really is. Neuro-linguistic programming? Puh-leeze.
Then again, the people who do that are richer than I am, so maybe I shouldn't kvetch.