I am a lucky father to twins and transporting them the A4 means using our rear facing baby seats on the back seats. I would like to have one in the front passenger seat and one in the rear so that either myself or my wife can keep an eye on them on long journeys. Is there an easy way of disabling the passenger airbag. I know some A4 came with key operated switch in the glove box, however, mine doesn't. Will I have to take it to the dealers to get this done and does anyone know how much they will charge? Many thanks.