As odd as it might seem, you can have it all! You will need a 7-pin Y-adaptor, which will plug into the Aux. socket on the 2300, then hang the BeoLink converter on one side and the Sonos on the other.
I have used this setup before, it works just fine. Enjoy!
We kid because we love.
Bang & Olufsen Tysons Galleria
McLean, VA USA