You would need to take up residence for the other region and obtain a passport or other national ID provided by the government to show that you are there. Then you would need to submit that documentation to Uphold and they would verify it. Once all of that and your information on the profile would be updated to show you’re in the other region that is supported, then you would be able to link.
Nobody knows. Not a single person. I provide updates as we learn more over at PSA: Unsupported Region