For what it is worth, three different guys in three different FBS conferences (one "power 5" conference) confirmed that they, and the PCOs, are being told to let the play complete itself, i.e., once the signaling official drops his arms, then hesitate momentarily (one thousand one, one thousand two, one thousand three), then start the play clock. After that, the teams are at risk of DOG, unless there is some really unusual delay in getting the ball spotted.
That would seem to be the right amount of time to at least secure the replacement game ball, and begin getting in to the U/C to spot. With this, I see far fewer "pump ups" than I initially imagined. I think we are "good to go."
Robert