Very good points by Walter. Including: "Spares: carry spare mittens and hats because it's easy to lose them in the wind, and
in snow they get wet."
I note that dog mushers here in Alaska always have their gloves/mittens on a cord. The cord can run through both of their parka sleeves. Or the cord can be outside their parka, run behind their neck and have a sternum strap and of a length such that the overgloves hang at about crotch level ready to slip your hands back into after using your hands.
Down to about 0F, I don't mind using big, thick gloves with no liner. Sub-zero, and I prefer inner gloves with very warm over mitts. Then, when I need to do fine work, I still have the inner gloves on for some protection.
I didn't see a PLB / SPOT listed. There are a lot of times I don't take mine along. Winter on Mount Washington, however. . . .
But the original poster may not have one - does anyone know the cell coverage, not just on top, but on the route up? I've been up a few times, but all before the cell-phone era. Personally, I'd be fine with GPS and cell phone for PLB-type uses, if there's decent coverage.