Deadmans-switch, nice. I always had a weird fascination for that kind of mechanism, because it inverts the whole situation. Where before you have to actively wipe a phone, now them taking your phone may be the mechanism that triggers the wipe.
id expect that youd be ordered to retain the data though, if an investigation is being done
But this stance amounts to giving up. Within the wiggle room a system gives us there are still ways to widen cracks or attach a lever, however small they may be.