I bought a thrashed Corally RDX of eBay recently and went to rebuild it only to discover many of the torx screws were rounded out or to tight to remove.
I drilled off the head and what was left unscrewed easy once the tension was off it. Didn't damage the carbon as the head of the screw protects it from the drill bit.
Did loads of them!!
Cobolt drill bits FTW.