How to get DAB/MMI/Aux on Audi single din Concert 2006 car

Hi All,
I'm considering buying an A4 Avant 2.7 which has a single din Concert stereo with Bose system. I'd prefer not to change the head unit for fear of messing up the Bose system.
Does anyone have any useful suggestions for getting the head unit to connect to DAB and have an MMI connection?
I rely on DAB, and like playing music from a couple of devices (apple)
I have some basic stereo installation skills, definitely not advanced. If there is an Audi head unit option, I am very open to it. I just don't think there is an Audi single din DAB system... correct me if I'm wrong!
Thanks!

Did you have any luck with this as i have just purchased a a3 2006 with audi concert but would like some kind of simple bluetooth and DAB as a bonus .

I didn’t pursue it, sorry.