You may want to consider silicon-free stonedust (commonly known on BYC as "sand" or "construction sand") for your next coop's bedding. Fires won't spread as quickly since stonedust is as flammable as a rock is (this is more of a just-in-case reason - obviously discerning the cause of the fire is...
You could also move it to areas of short grass for grazing. I'd attach wheels to whatever you'd use as a tractor. The chickens are less likely to escape if you lift the tractor a small bit and move it that way.
I'm not really sure what you can do :( I'd try getting them to a space where they can stay temporarily - if you have garage space I'd cover the floor with cardboard and get a temporary chicken tractor to keep them in. Something that they won't fly out of, but is also cheap and portable. If...