How odd, given that after 250 or so years or so of staunch republicanism, the US is now up Shit Creek without a paddle!

UK democracy survived Boris Johnson and will survive Liz Truss, because they are just Prime Minsters, not Heads of State. US democracy barely survived President Trump and likely will not survive President DeSantis. That's what happens when your Head of State is a politician with an agenda and power. British Heads of State (monarchs) deliberately have neither.