RCD310 Bluetooth options

[Robear]

I have a Multivan Edition 25 that came with the RCD310 but no bluetooth module. Im looking for the best option to fill this gap.

I have had an RNS510 (bought from Lithuania) in my last multivan with an aftermarket parrot kit which worked fine, but I don't think I nee the navigation anymore, so no longer yearn for the RNS510.

I would like to know what the best cost effective combination for bluetooth would be. I can find bluetooth modules on ebay but then need to have it fitted in Sydney. Or should I upgrade the head unit with something like the rns510 that may come with bluetooth as well.

I would like a factory option as opposed to aftermarket, just to keep it all genuine.

Thanks in advance!