“…0.5 mg of estradiol taken sublingually, roughly every 6 hours”? Do you wake up during night to take a dose or do you take one right before sleep and right after waking up?

No, the Blightfall you linked is from 2024 and it is not it.

You can carry a cheap second phone with battery removed (airplane mode is not sufficient) for this purpose specifically. In case you must call someone, you put in the battery and call.