Is there a way use A2DP the other way around on a N800? That is, use a N800 as a bluetooth headset.

I have a Nokia N75 and while I love it, I absolutely hate the Pop-Port in order to use a headset/headphones and USB connectivity. I have the latter solved by using the Blutooth File Transfer Protocal. Since I carry around my N800 often, it would be nice if I could use the Headset Profile and A2DP with my N75.