I've worked as an Aurora guide. Be prepared for long nights, driving in the dark, not having a real social life, losing out on way too many days of skiing, and basically never seeing the sun.

Portage Lake and that's Maynard Peak in the center.

Check out Bama Sokkets

Largely, I use basic/generic versions of insoles in my XtraTufs (the Alaskan version of these kinda boots) to suck up volume and provide a more snug fit inside the boot that prevents your heel from sliding around.

I use the good SOLE footbeds in my skiboots for more comfort and boot control.

You can. They work wonderfuly.