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You're unable to change the country, Scott D1.
When you enter the billing info, the address in QuickBooks should be the same as the one on your credit card statement. Having said that, you can only add a UK credit card.
I'll share the article on how to update the payment method or information for your subscription for more information.
If you have additional questions, feel free to drop a comment below.
Explore the trial period of this 3rd party tool to migrate your data from QBO UK version to QBO US version.
Once you are ready to proceed, open you new QBO account. Make sure to click the Buy button to get the discounted price for up to 6 months. If you purchase from the trial account, you have to pay the regular price.
Hope it helps.