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I've changed between UK (main) and US a few times, I registered for a USA delivery service (i.e you buy, ship to them then they ship around the world) for free & got a postal address with them.
I've then added that address to Amazon and can now change country by changing my primary address. I haven't had any issues using my bank card against either address (again though I registered for a USD mastercard from a third party so i dont have to pay conversion fees).
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