Its your money, but I personally wouldn't bother, a very good excuse to give it a longer drive often, short journeys are the worst thing for a K series, it needs warming, about a mile and mine is up to temperature , then drive it like you stole it!!
If its a steptronic/stepspeed use the paddles, which will get the fluid nice and hot and burn off any moisture. I have a good quality de-humidifier pad which stops any misting up, even with hardtop on!!!!