British Israelism claims that the throne of David was transferred to the British Isles at the time of the Babylonian Diaspora and as a matter of fact, the heralds of Britain claim that the British Throne is actually the throne of David by virtue of their alleged possession of the Stone of Scone. At her coronation Queen Elizabeth was crowned "Queen of thy people Israel" --- amazing claim.
Using the same reasoning as OP's, the British Israelists claim that the Messiah can't rule from Jerusalem and won't because the throne of David is now in Britain. That is why there is so much anti-Israeli sentiment in many places in the British government.