Have you attempted to call an auto electrics place yet? Some are even mobile so they will come to you at a time which is convenient. You will however have to actually find a number, then pick a phone up and ring them yourself.
Sometimes forums have the answer, and sometimes it just takes a little bit of nouse and common sense.
Ye I have spoken to a few auto electritions and they all said that I would have to go to the factory and get it sorted out.
The factory said that I would have to order and reprogram a new key which costs a fortune and takes forever to get back cuz they have to order it from france.
They key does not start the car or unlock it, but its little light does come on when pressed.
I've been using one key for ages, but if something happens to this one, im farked, and the spare key was used for the autostart on my alarm, so that hasnt been working in ages either.
Guess its just a factory mission then, no way around it :S