Earlier quoted context omitted.
I would be concerned about that. Carbon fiber isn't much better than asbestos, and while both are fine if sealed in a wall, we're talking about a keyboard taking daily wear and tear with the fibers sealed under a thin layer of glue. A keyboard cannot possibly need the tensile strength, so why not just use plastic?
People break keyboards all the time. Reinforcing them with carbon fiber seems reasonable to me. You seem to be confusing carbon fiber, which is a mild irritant like fiberglass, with carbon nanotubes. It's goofy that the keyboard enthusiasts got taken in by the marketroid term “forged carbon”, though.
If I did need a stronger keyboard, I'd rather have it reinforced with steel. That would have the extra benefit of keeping it in place.