I think if you buy a park pass it includes the rescue insurance but id check your specific situation. Im pretty careful with that stuff as a chopper ride out is tens of thousands of dollars and some even more than that.
I spend about half the year outside of the USA and so also bought a 5 year Med Jet insurance for the family. Those people are legit professionals and will send a rescue pretty much anyplace on the planet (with a few exclusions for active war zones) and fly you back to a hospital of youe choosing in the usa.
I will never forget seeing a guy i knew pretty well die in a third world hospital. It was in the tropics and must have been 100 degrees in the "hospital". We bribed the doctor to get his bed rolled out of the main stadium type room with hundreds of people. They let him be in the baby delivery room and i remember looking at the scale to weigh new babies and it looked like it was from the 1920s with blood caked so think it had ridges. That is burned in my mind and im not getting stuck im that situation.
I dont know why im telling war stories, but i also was locked down in Peru earlier this year and airports were shut because of civil unrest and a guy in our hotel had an issue with the altitude we were stuck at 11,300 feet and his lungs went out. By the time the airport opened he needed medical evac and his family got a quote for $80,000 to fly him back to puerto rico. They couldnt afford it so he died up there.
My point is, the insurance is a key part of me being willing to take the risks i take.