FLEXPWR--- yes it's occurred to all of us. I was mistakingly assuming that the A320 was the same as the A330 in that we don't have C/B's in the cockpit to pull at all. Only computer reset push buttons.
On the A320 they apparently have C/B's in the cockpit and I guess there might be one for the Wipers, if so I see no problem pulling it out under those circumstances.
Don't confuse pulling/resetting a C/B with a A330 style computer reset button used in conjunction with the QRH reset tables.