This is my solution:
Got the bluetooth clip for my birthday (and i can't remember what it's called...but you should be able to find it on amazon (my friend got it from amazon.de)).
It supports normal stereo output like you'd get if you'd use wired headphones directly with your DHD. While in stereo mode, you won't be albe to use the microphone. If you get a call, the clip switches to mono output and microphone input.
The in-ear headphones you see in the picture are from one of my old sony ericsson cellphones, but you can use any headphones with a 3.5mm connector.