Chris there's a few solutions you could go for. One would involve a BT car kit and using the mic that comes with that but not sure you'd get a better quality.
There's a Reuters kit
The Mobile Journalism Toolkit contents - Reuters Mobile Journalism
and I'm not sure what they mean by 'speacial adapter plug' but it might be found in the answer here... found on the net
"We've done the external mic succesfully both as a wireless solution and as wired. Using a bluetooth mic will work, but beware that there are audio conflicts between bluetooth and WiFi on the
N95. So if using bluetooth, use operator connection only.
If you want to use a wired external mic, buy a 4 pole 3.5mm jack, not the standard 3 pole headphone jack. Wire the outer two connections too your mono mic, and leave the other two unconnected. That's all there is to it. Your microphone may require a power source depending on the model.
The Reuters toolkit shows a Sony ECM-MS907 mic. This is stereo and not needed as the
N95 can only accomodate a mono input.
We also made an adapter to allow a wireless FM signal to feed audio via the internal FM receiver. This is great for bands or lectures. use the uadio from the mixing console and walk around the room with the
N95, still getting the same clean signal."
I'll see if I can find out more about the FM reciever or the special adpater but hope this helps for now.