I use the OR Windstopper gloves (PL400) as the thickest "contact" glove I can manipulate a weapon, flashlight, etc. with. I use either the OR Firebrand glove shell or the jarhead mitt shell over that, depending on what I'm doing, with wrist lanyards attached. Then you can de-glove quickly and not lose them in the snow or whatever.
The Windstoppers will work standalone down into the teens, but only if I stuff a hand warmer down in there. But that is for early morning runs/rucks and wouldn't work for you, so yeah, you're gonna have to run a layered system.
If you have an REI near you, you can get a pretty good idea of what a good layered system might look like. OR, North Face, and the REI house brand are all good stuff. Kinda like buying boots, really helps if you can try them on in the store and see what contact gloves work with what shells.
I'm pretty sure they carry the OR Windstoppers. So using that as a base, find a glove shell that works with them. The sizes are all over the place, so hand-fitting is pretty much required.