Billy, I saw a playoff game once where the official simply stopped the game and let the subs in in a blowout. No pretense whatsoever. I see nothing wrong with an "inadvertent" whistle here. In HS, subs come in during IWs.
And I see no reason to go through all the pretense of "talking to the table," tying your shoe, fixing a contact lense, etc. Hell, the point of contact lenses is so no one knows I use corrective lenses.