Power over Ethernet to LPC17

So I finished my first LPC17, but I have another one almost finished and I was wondering, could I remove jumper J17 and wire pins J1 to the MagicJAck Ethernet somehow to use power over ethernet?

That way I could just use one cable to my synthesizers to send MIDI data to and eliminate the USB or external power.

Something similar to this but standard PoE: http://shop.tuxgraphics.org/electronic/detail_avrwebserver5_poe.html

You would have to replace the 7805 by a switched voltage regulator due to the high voltage (48V).

Or you would have to modify the ethernet cable.

Details: http://tuxgraphics.org/electronics/200903/hobby-poe.shtml

Best Regards, Thorsten.