How do you take out rusted/fused headlight adjustment screws ?

I bought a 99 Chevy S10 with the intent of fixing her up. So far, I've been blessed enough to be able to cut a great deal of rusted parts out and replace them but there are small things that I don't think that I can just cut out like headlight adjustment screws. How can I remove these things or what are the pieces called that they screw into on the frame? I'm afraid of drilling them out because this is my first time doing anything headlight related. They are a torx head that I just stripped out. The heads are almost too soft to grab onto with some locking pliers/torque locks. What can I do?