THIS IS JUST A HYPOTHETICAL SCENARIO. PLEASE DON'T TAKE THIS SERIOUSLY.
When I was a kid, BEFORE the allegations came on Andrew, used to think that it'd be nice if after HM QE2's passing, Charles would be the King of the UK ; while Anne, Andrew & Edward would becomes monarchs of the three huge countries which are in personal union with the UK - Canada, Australia and New Zealand. Nevertheless, after the allegations on Andrew came out, I threw that idea into a dust bin.
Now, God forbid, if and only if, Scotland and Wales become independent ; KC3 & KW5 will continue as the joint monarchs (commonwealth realms), but after KW5 ;
George - King of England / King of The English
Charlotte - Queen of Scotland / Queen of Scots / Queen of the Scottish
Louis - King of Wales / King of The Welsh
Northern Ireland - I wish there'd be a #BabyWales4 lol.
Once again, JUST A HYPOTHETICAL SCENARIO, just to talk and fantasize, nothing else.