I recently bought a few pages of printable stickers, A4 size. So thought it could be used for this application. I don't have autocad on my computer anymore but it would make it easy to draw up unusual shapes and then use hand tools to cut them out. No need for cnc!
Well, crack and peal manufacturers usually make the paper with high tack adhesives which makes it a little difficult to remove the paper from most surfaces...
if you can find low tack version (something similar to window masking), you can use it directly on the carbon... try a small piece first and see what happens
when you try to remove it...