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Don't you use a snorkel in ice diving so that you don't have to breathe your regulator until it is submerged? I think this decreases the possibility of icing up your regulator.
There's no reason to use a snorkel. You're basically submerging through a hole in the ice. Breathe from the atmosphere as you get in the water. Once you're ready to descend, inhale (atmosphere, not from the reg), and descend. Begin your exhale once you've purged the gas completely from your BCD and drysuit ... by then you're mostly, if not completely, submerged. And by the time you need to inhale, you're going to be several feet underwater.
... Bob (Grateful Diver)