Transporter recently fitted the latest Bluetooth to a new Skoda, so I believe it can be done. Have a look at his thread in the Skoda section for details of where its from.

Be less than $500 landed + fitting and coding. I'd certainly be doing it if I were you. Also, if it turns out not to work with the Multivan, theres plenty of Golf/Tiguan drivers who will take it off you for no loss to you .....