I think candles will see you through. I was in the Air Force in North Dakota back in the 70s, and we had a winter kit similar to yours. The theory was that you'd stay in the car, light a candle with a leeward window open a crack (the wind blows from the same direction all winter in North Dakota), and cover up in the blankets/sleeping bag/whatever and wait for the snowplows to bury you further. No! No! I mean come by and discover you.

Getting out of a stuck car in a blizzard was strongly discouraged. While I was in North Dakota, someone died every winter trying to walk somewhere in a blizzard that they'd walked all their lives (and probably in other blizzards). Leave the flashers on, light a candle, curse the darkness, and cover up.