I have had several knives that I have put together out of D2 (enzo blades to be exact). it is a great steel that sharpens easily and holds the edge well. yes it will take a natural patina, but not nearly as quickly as say plain ol' tool steel.
I live in the desert and have never had a problem with rusting or any of that. but with you living in alaska a light coat of gun oil every now and again couldn't hurt
as far as performance, if you enjoy O1 tool steel, you will love D2. its just as good but keeps it's nice looks a lot longer, and in my experiance holds its edge better, but that depends more on the heat treat.