A320, EU average exposure to white magic.
As early as available to resume the standard sequences of everything. Running the OEM version has flaps-set before F/CTL, when stationary prior to taxi. The FCTM guidance quoted at #3 was consistently observed, namely so as we deiced with the flaps up all the time.
Fortunately no overly eager and half-applicable company internal memos or SOP on that. In this case the Airbus books have some gaps if combed with Vulcan brush, but no need to formally bridge them if you know where you are going.