I’m now envisioning the opening of King Ralph…
Right. Zimbabwe used to be both a democracy and a member of the Commonwealth. We left.
Technically we were affiliated with Her Majesty via the Commonwealth, but she no longer reigned as our monarch. (Now, “His Majesty”)
(Our own internal stupid politics led us to be one of the few countries to have left the group.)
I guess the next question is this: If Andrew is removed from the line of succession in one or more countries, can he sue? If so, what entity does he bring the suit against? And would he sue for damages or for his restoration to the line of succession…or both?
Based on historical precedence going back to William I of England (the Conqueror), I think his only option at this point is to raise an army and take the throne by right of conquest. How hard can that be? 
I doubt that Andrew, as he is now, stripped of his royal titles, would be invited to sit for such a photo.
But that’s exactly why he survives and inherits.
I can see, centuries from now, the history books talking about the first of the “Andreyan pretender revolts”
But we now have Tik-Tok to simplify the process.
Speed, bonny boat, like a bird on the wing
Over the sea to Little Saint James… 
Can’t speak for other countries, but no, not in the UK. If Parliament changes the relevant law, tough. What basis would there be? The only relevant legislation one might use against an Act of Parliament would be the Human Rights Act, and I can’t see any of its provisions covering such a situation; even if it did, all the Supreme Court could do is bounce it back to Parliament with the observation that the succession law wasn’t compatible with the HRA.
I’m proud of the unusual ways some of our Monarchs and nobles have ended their lives. 
Henry 1 died of food poisoning from eating “a surfeit of lampreys”.
George, Duke of Clarence is supposed to have drowned in a butt of malmsey. 
I thought it was that he was supposed to have been drowned. Involuntarily, not accidentally.
I can’t speak to the murder or not aspect, but I could imagine some rich dude who really liked wine and was really really drunk trying to drink from a big open-top container & falling face first into it unconscious. Oops.
Best way to die! 
Takes “drowning your sorrows” to a whole 'nuther level. 
We’ve had a lengthy, loony thread about a celebrity supposedly drowned by wine.
Happened in Britain too. 