But “My Country ‘Tis Of Thee” is to the tune of “God Save The King (Queen)” isn’t it?
Yes, it is. And how suitable that is depends on whether you think it’s an insult or not to write Yankee lyrics over that tune. Is it a stick in the eye to Americans to use British music, or a stick in the eye to British to overwrite the King/Queen?
“I vow to Thee My Country,” from Gustav Holst’s “The Planets,” is a sublime patriotic song that could be an anthem.