You could always try a hdmi to ethernet converter and use your existing power supply as a network to send the signal round your house. Convert it back to HDMI again behind your TV and plug it straight in. (Must admit I don't know if the signal will be copy protected though...)
You have a large plug in each socket which has an ethernet port on it too. I use them all over my house for data. Works like a charm...
I have a variant of these:
http://www.tesco.com/direct/devolo-d...FfOhtAodGnUAJw