If you are willing to use a custom driver, please see the post below. This is the same driver that the official driver is based on (possibly identical). I have submitted a request to have this custom driver updated for Emergency Notifications. Keep an eye on that thread.
I'm not sure if the Hubitat team plan to update this driver with small modifications as it is more of an interim solution until they get their mobile app in production. I'll let @bravenel speak to that.