> I'm dual Austrian-British

How so? Since Austria doesn't (typically) allow dual citizenship.

> Austria doesn't extradite to the UK.

With what guarantee? In 2013 Austria forced the landing of the plane of the Bolivian president on orders from the US because they had intelligence Snowden might be on board.

So if you think Austria will hesitate to ship your ass to the UK if you piss off the wrong elites, just because there's no official bi-lateral extradition agreement, you're kidding yourself. If needed, they'll just make up a spin story that you're some major child molester or something, to justify their actions in the media and reassure the public on why the violation of your rights was justified and they'll never ever do it again to anyone else as long as they behave, pinky promise wink-wink. In short, the people with guns can break the rules at will with little to no accountability.