The Livonia Warriors FRC Team 2832 has developed a break-out board that fits snugly on the roboRIO controller to provide access to the MXP port. If interested in more details please view the flyer available at:
https://drive.google.com/file/d/0B_N...ew?usp=sharing
We used it successfully on our robot during an off-season competition for Beta-testing to roboRIO.
Thanks for looking and good luck to your team in 2015!