Hey LATS, have you tried USA Custom for a cocobolo fretboard? Strange that Warmoth offers 3 species of Rosewood but cocobolo is the one that causes allergic reactions, seems like an operation that generates that much wood dust would be able to take precautions, since several of the woods they do offer are known to cause reactions with some people, hmmm.........
Well USA Custom Guitars does not carry cocobolo, but will build if you supply the wood and it doesn't sound like they are charging extra, might be worth an email.....................