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Lars, you’ve still overlooked a large chunk of the planet - the whole of Asia, USSR, Africa and the Americas.
I’ll stick my neck out a bit and suggest forget the USA - mainly ‘cause it’s so much better here.
But Yunnan in China does have dark skies - having been to Lijiang and Shangri-La where you could be observing at 3,500 metres well above most of the worst of the atmosphere, and free of light pollution, the naked eye limit is 7+ and while the temp does drop to zero most nights with a little snow, it’s in the tropics so it doesn’t get much below that at night. Though the local peaks are above 5,500m, and there are peaks above 7,000 on the horizon (Tibet).
And there’s New Zealand, particularly the South Island - near Mt Cook and Fiordland it is so dark on a clear night the gegenshein is visible naked eye.
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