Ok If anyone is interested in this PM me. I will give my EMail.

I have pulled apart an old Jabba 250v Bluetooth headset.

Attaching it to the appropriate plug and using the little vibrate connection to trigger the PTT should be easy. All that is required is adapting software on the N800 to send a ring signal whenever it needs to activate the PTT and convert the sound signal.

I will hunt down a spare plug for my VX-7r and experiment.