Cop sees phone, cop demands you unlock it and hand it over is exactly the scenario I want to avoid. Or cop pretends bluetooth isn't working and demands you for

Cop sees phone, cop demands you unlock it and hand it over is exactly the scenario I want to avoid. Or cop pretends bluetooth isn't working and demands you fork over the phone so they can make it work. Or you accidentally unlock the phone and cop demands you hand the unlocked phone over. I see plenty of downsides but basically no upside (until someone gets their hands on the state's signing keys).