I'm not so sure that would work. Because of the extreme cold of the upper atmosphere ~-40C I suspect the ice would be very hard, unlike the ~0C slush and freezing rain deicing is generally used on. It may actually be colder than that if the ice is formed by chilled air falling off the oxygen tank prior to launch.More prosaically, the de-icing procedures that aircraft go through ought to be easy to incorporate. Squirting a mess of de-icing fluid into the critical parts in the moments before their deployment should be straightforward enough...unless such could cause a disruption in maintaining the perfect trajectory??????
Maybe some sort of deicing fluid sprayed on the critical parts while the vehicle is sitting on the pad waiting for launch would keep the ice from forming in the first place if it's not too cold. I'm sure they will be checking the temperature around the moving parts pretty carefully in the near future.