[Zeke]

Yes, you can easily reshape a flat blade on a bench grinder or with a good file. They aren't that hard (most) or they would snap too easily. You MUST dunk the blade in cool water often. If you see the tip change color from anything but a light blue haze, it's done.

I have dressed a Phillips head driver by blunting the tip a tiny bit followed by just kissing the four blades to make them more flat (with definite edges as opposed to all rounded over). They work better but not as good as new.

Speaking of new, the lowly screwdriver is one tool you should spend more on. Anything included in a set of economy tools is garbage waiting to booger a screw.