Great question — answering as the UphillTech team:
Many outdoor associations (such as the American Alpine Association - see their web page on rescue insurance ) have fairly inexpensive coverage, including rescue benefits, for the types of activities their members go on. For the AAA, membership at the $250/year includes $300,000 in medical evacuation coverage. This is applicable anywhere worldwide and does not require you to be on an 'expedition' - it would include your safari trip in Africa or climbing Mt Kilimanjaro equally well. I recall similar coverage options when a member of the Dutch Alpine Society many years ago.
Full answer by Jon Custer: https://outdoors.stackexchange.com/a/29627 (CC BY-SA 4.0).
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