I know it’s a long way around the barn, exactly what you don’t want for emergency alerts, but @taustin does have a virtual smoke alarm and a virtual water sensor which can both be actuated (turned on or off) from a regular routine.
So you could have a regular routine where the trigger was your contact sensor and the action was “turning on“ the virtual device which serves as the alert trigger in smartthings home monitor or another automation.
The good news is all of this does run locally, unlike the old groovy custom versions.
So I don’t know if it’s of any interest or not, but it might be a workaround for the time being.
