There have been a number of "what if" Tv programmes
what if hitler won what if someone were to shoot George bush etc.

What if CES had won at Culloden? what sort of ruler would he have been? would the clearences have taken place? would he have "welshed" the Highlanders and had is own agenda which didnt include them?
would his French allies have taken advantage and invaded England? would they have then dumped CES ?

would CES then turned his eyes to Wales ?

who knows
CES doesnt come across as much of a stratergist, what if the English had rebelled if he had gained the English crown?