Retrofit RNS-E ?

Hello everybody.

ill be celebrating 18 years of ownership of my A4 cabrio this year. Part of me knows I should change the car but I just can’t bring myself to let it go! It still turns heads on a sunny day (when it’s clean!)

something I’ve always wanted to do is upgrade the head unit from a symphony 2 to an RNS-E with nav and Bluetooth phone. 
everytime I’ve looked into it I’ve quickly gone out of my depth.

can anybody recommend somewhere in southwales or border areas that could do it for me? 

Everyone I’ve approached has tried to persuade me to go down the aftermarket/carplay route, I know this would be easier and probably cheaper but I’m keen for it to look original to the car.

Anyone have any suggestions or experience of doing it?

Thanks in advance!

Jordan