@Adrian.S I think, at the minimum, this requires changing the lock function so that the watch can be operated under the lock but without the risk of pausing, stopping, or rebooting it.
We should be be able to fully use the map and climb guidance under the lock.
But perhaps an alternative solution is to move the reboot function to another button that is less likely to be pressed (not sticking out like Start), or requiring a combination of two buttons. or extending the duration of how long it needs to be pressed to reboot.