I got epoxy in a blind nut on either my Astro Hog or Four Star and broke the screw trying to get it out.
I was able to use a dremel cutoff wheel to make a little slot in the broken screw.
I got my soldering iron hot and held it against the end of the broken screw for a while and it broke down te epoxy well enough that I could use a flat blade screwdriver to remove the screw before it cooled off.

I do not know that your screw is epoxy bound but it might be worth a try. If it doesn't work, a punch and hammer should knock the blind nuts out of the firewall.