I'm proposing a rule which will make their picks invalid if they don't use this format.
I do not support a rule offered by you.
If non-format-pick is cancelled, time for correction = 0. But time of dialogue with the player increases repeatedly. At any deviation the manager will discuss with the player, whether it is possible to consider, that the pick conforms to a format. The general expense of time will increase.
Numbering of picks is problem for the player. If the player has confused numbering, it has difficulty to make a cancelling or replacement of the pick. When I the manager let all picks will have number PAW??, I'm indifferent.