So the next semi-permanent solution is to set up a tarp in the corner for them. I grabbed a pallet I had stored away, draped a tarp over it, and...it works! It isn't pretty, but it is also not supposed to be the long-term set up. I'm waiting to see if the chickens like it, and make any tweaks to the design before I make it "pretty".
Unfortunately, I also came up on the wrong side of the pallet....while I was setting everything up, I leaned the pallet against the fence and turned around....and the pallet didn't stay leaning against the fence. Luckily it just scraped and bruised my leg, no broken bones....that was a close one!!