Is there a modifier which "shaves" off 0.1m of every face equally? As if it were to go over every face and move it 0.1m in the negative normal direction, and clipping it properly. Displacement seems almost it, but it warps the shape unequally.
Resizing doesn't do the trick either.
Edit: I'm trying to make this keyboard 'Enter' key work. All of the other keys have the same displacement modifier. As you can see the enter key gets a weird dent from the displacement modifier.