Thanks everyone! And thanks Eugene for linking to those articles, I did indeed use those approaches on this trip, as my gear philosophies and ability to do a trip like this have evolved hand in hand.
Here's a quick highlight of the gear I took:
Always Worn:
Cap 1 sleevless
Cap 2 longsleeve
90s vintage windbreaker anorak
Cap 2 boxer briefs
Lightweight Patagonia nylon trail pants (name escapes me)
Ultralight Smartwool ski socks
NRS Hydroskin socks
Dirty girl gaiters
LaSportiva Crossleather
Often worn:
Cap 1 earband w/visor
Smartwool beanie
Arc'teryx Alpha SL pullover
Montane Featherlite pants
OR Omni gloves
pile hoody (old Patagonia hi-loft R3 pullover to which I added a hood of R2 fabric)
I also had thick wool sleep socks, my BPL UL60 quilt to which I added a full layer of 5oz Climashield XP, my Trailstar, an esbit stove, Snowpeak 600 pot, etc.
There wasn't much room for error with my clothing on Gunsight Pass. Being able to get in the hut, warm up in my bag, make soup, and put the pile hoody on away from the rain was nice. I would've been ok without all that, but would've gotten wetter adding the layer outside under a stunted tree. I did wish that I had my Endeavor Mitts along. With them my hands never would have been cold. As it was they were wet all the time, but only rarely cold. I wore the pile hoody all the way down to the TH.
Central to the success of this system was the ability to keep moving and thus generate heat. I consider it a perfectly safe approach for me, but going over Gunsight in such tough conditions provided for little room for error.