Spain is the country I wanted to move to anyway, which Brexit destroyed my hopes of.
For anyone else that finds this potentially interesting, this seems useful:
https://balcellsgroup.com/work-remotely-from-spain/
https://balcellsgroup.com/non-lucrative-residency/
(note that they're just the first links showing up in DDG, so there might be better ones around)
The US is the only country I know of that demands income taxes from its citizens when they are non-resident. Citizens of most countries would expect to pay local income taxes only when they emigrate.
They wanted to tax me on my "worldwide" income and requested that I pay the difference between what I was making in the US vs. what I would be paying in Canada had I been living there.
It wasn't something I had considered in my planning so good to look into before you go!
It's still a little weird to me though, as someone who would expect my own country to relinquish all tax demands if I'm not actually there!