Skip the immersion heater. Go with the silicone heater pads that stick on the oil pan. Add a battery blanket heater. And an interior heater, plug-in.

18" wheels with winter tires. I like Pirelli Scorpions, not sure about your size.

Warranty is fine in Canada. Wouldn't expect maintenance to be though.

Plan to lose at least one windshield. And lots of rock damage.

Skip the under guard protection.

Carry a winter emergency kit with tow rope, flares, safety triangles, space blankets, snacks, matches, candles, tarp and rope, hatchet, traction mats, jack, coveralls, etc. I am going from memory, but that is what I used to carry, all in a Rubbermaid tub, plus a sleeping bag. We didn't carry spare parts. We did file "flight plans" for long solo drives, so someone knew we were out there.

I llived at mile zero of the Alaska highway, and covered a territory throughout the Yukon, NWT, and Nunavut. I wouldn't have had a BMW there. Yes, you are a little crazy.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue