My tags arrived! It sounds silly but currently it's easier to set up a bluetooth pairing than simply toggling bluetooth on and off (easy to turn on with the N9 but not so easy to keep it on without pairing to something...).

For the time being I used NFC Tag Writer to set up pairing with my non-NFC hands-free for the car. With this setup a second tap on the tag unpairs the hands-free but doesn't turn off the bluetooth, so this is a work in progress...