I'm sure there are more than a few bright ideas out there on this - bring 'em

Imagine truck parked at -40F for 4 days while at cabin, no way to plug it in. Autostart "sentinel" cold weather mode only good for 24 hours then terminates as a "feature" so you don't run out of fuel. Truck equipped with battery heater + insulated blanket, block heater, oil pan heater and transmission pan heater.

What tried and true systems have folks used to revive the truck to where it will start? My preference would be something portable (take it with so you have it when truck gets broken into) that doesn't require any electricity. Open to any clever solutions/procedures, even if they don't fit the preference listed above.

Related to this, what is the consensus on motor oil in these conditions? I'd think it'd make quite a bit of difference. I'm running blended Motorcraft 5w-20 in my 2009 F-350 V10, and looking to swap to 0w-20 Mobil 1 or Amsoil full synthetic.