Mike Drake of Longmont High School (CO) sent me the below video of the "choice route." Note that I have updated my original article on the choice with these clips. But here are the clips below with brief descriptions. See the full article for more of an explanation.
First, here is how Drake has his kids run the "choice." It is the same concept I described, though he has added a "safety divide" or climb type route by the tight-end to help stretch the safety; it turns it into something like four-verticals from trips, though with the choice.
First, here is the play against Cover 3 with a zone-blitz. The blocking isn't quite there but the QB moves in the pocket and finds the seam-reader (slot receiver). The free-safety here jumps the tight-end on the climb/divide route, which makes the slot wide open. It is actually the backside cornerback who makes the tackle in the end zone, though he is too late.
And the video:
Against Cover 2, where the safeties drop very deep, you can see in the video below where the seam-reader works off the underneath defender and under the safety into the void for a nice completion.
And finally, against Cover 1 man they get a matchup they like and throw the go to the singled up choice receiver (though they don't complete it). The quarterback does a good job getting the ball there before the single-deep safety can get over. On this play they also keep two extra guys in to protect, so it kind of becomes a three-man route.