Misconduct prior to PK

[Eastshire]

Fed rules:

A has been awarded a PK. A13 is the designated kicker. I instruct A13 to wait for my whistle verbally while holding the whistle up and pointing at it. I turn and remind the keeper to keep her line and then turn and back to the goal line while confirming my partner is in position (2-man system). As I reach the line, but before I blow the whistle, A13 takes the kick and the keeper saves it.

I shut it down and caution A13 (USB). This is where my quandary is. I don't see anyway under Fed rules to get around restarting with a new PK. The rule is very clear that a whistle is required to restart with a PK (9-1-3) and the IFK for misconduct only applies if another restart doesn't take president(13-2-2l).

Am I missing anything here? It just felt wrong to give them a "second" bite at the apple but I don't see A13's action as a PK violation since the ball hadn't been made ready for restart by the whistle.