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I had similar thoughts years back when journeying to Northern Canada.
The temperature varied between about -10C and -30C with two night of -56 and -58. Cold enough to freeze a running engine!
My advice is to keep the lens(es) at ambient (within reason-most stuff just stops at about-35), and the camera warm.
I had no problem with mist or frost (I also kept them in a bunch of little sacks of silica gel) on the lenses.
I did however, chew through batteries like peanuts. The severe cold sucks them dry in minutes. I believe now you can get little snuggly suits for your cameras that help considerably.
I used heat pads and found them pretty useful, but they have a limited life in very low temperatures if not kept insulated.
Otherwise keep your camera body warm inside your jacket when not in use.
Also minus 50-odd is like nothing you've ever felt ( unless you have-then you know what I'm talking about) so get a big down parka and keep your mittens on.
Have a great trip - the lights are spectacular!!
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