Really, it's not that bad. Your ice puns, on the other hand...
Seriously, though, most of Astrologian's magic is unaspected aether. If your character is naturally attuned to ice, perhaps those spells unintentionally gain that aspect. Bam. Astrologian with ice magic. Besides, if no one's really calling you out on it, I don't see it being that big of a problem.
Oh, you recognize Vektis' work...how very...nICE of you! and thanks for the answer!