The tote idea is what I was planning to do.
I was going to take two super long, supersized totes, stack them with the top one upside down, drill holes all around where the lips of the containers meet, wrap wire through there to hold them together, saw out the top, drill more holes, attach 1/2" hardware cloth and make a top-entry access door, toss in a bunch of shavings, and that's that. A deluxe whole-flock chicken taxi!
But man that fire moved fast. In anticipation of future fires (God forbid), I'm pre-prepping everything as soon as I get home.