We wanted the piano black trim instead of the wood too. Mazda won't order it (do it) like that. The dealer might say they can, but they would send it out to a 3rd party for painting/vinyl etc. Best option is to remove the trim yourself and vinyl it piano black, or get the actual piano black trim from a parts sale or something.
In the meantime we are living w/the fake wood trim. Thankfully it is quite dark and you really only see the wood trim in the direct sunlight.