Update I have come to a decision. Thank you to all who contributed suggestions. Please feel free to keep the discussion going to help others.
route everything through a VPN
I can see it now:
“SOS I need help, I’m stuck in an underwater cave just outside Tulum, Mexico and I’m running out of air!”
“Finding your geolocation, we have determined your cave is in New Zealand. Dispatching rescue team to the Mines of Moria.”
EDIT: Don’t ask me how someone got satellite phone signal in an underwater cave lol.