Thanks for the post , votes, and comments. We are aware of this limitation and are targeting sometime next year to improve this experience. In the meantime you can sign up for a new account in your desired country and transfer your assets to the new account via Support.
-Azure Billing TeamPedro Santos commented
Need to move my subscription from a French entity to a Portuguese entity...I gained my first gray hairs...MSFT is the only company in the world, that I know of, that does not allow the change of ownership of contracted services...Not sure if this is entirely legal...