A makes a first down just short of the goal line with 1 second left on the clock and no time outs. They quickly line up and are set before the ready. As soon as the whistle for the ready sounds, they snap the ball. Legal or not?
I think the better solution is to just end the game. Works best if the home team has the ball.
I would just announce to the crowd, 'By rule 7-2-6, all offensive players must be set for 1 full second before they are allowed to snap the ball. Since this is not possible, the game is over, by rule.' Then walk off the field high-fiving the other officials on a game well officiated.
Seriously though, I've actually found an oddity here in the rule book where it's not clear (even though we know what we do):
Note that this rule actually states this:
7-2-6:
After a huddle or shift, all 11 players of A shall come to an absolute stop and shall remain stationary simultaneously without movement of hands, feet, head or body for at least one second before the snap.
2-39: A shift is the action of one or more offensive players who, after a huddle or after taking set positions, move to a new set position before the ensuing snap.
If the offense is running a no-huddle, 7-2-6 does not apply. According to 2-39, a shift is NOT the action of going from one play to another. A shift can only happen AFTER the players take set positions.
So, if the offense is running a no-huddle, what rule is violated when all the offensive players just run toward the line, and as soon as the snapper makes it to the ball, he snaps it without waiting for everyone to be motionless for 1 second?