Unfortunately for most of us Counter-Strike players the idea of remapping any keys is a non-reality at this point. We've been playing the game for 20 something years and our brain has accepted keys as they are.
I guess that's what happens when you play using the same configuration for 3000 hours of playtime. Fortunately, you don't have to remap keys since it's already mapped to ctrl and c, but you would have to remap your brain.
Edit: It looks like it has a notification to use C while in windowed mode