Interesting premise, but I believe you try TOO HARD to make the Brits/Colonists/Dutch stronger while trying to CHNAGE as LITTLE as possible in the rest of the world. A different king of England will definitely have a big influence on the overall history.
Some things I think are implausible:
John Churchill, Earl of Marlborough was "out" of favor with Wilhelm II and only later as a protegee of Queen Anne (thanks his wife) was given his OTL command. With the Oranjes still in power, I assume that the Churchills should not be back in favor in TTL (but its your TL of course)
1756 Treaty of Versailles - the French-Austrian Raprroachment fell together with a cooling of relations between Britain adn Austria over issues in the Austrian NEtherlands - those are already Dutch so there is no reason teh Brits and Austrians become Enemies - Though the better English Prussian relations might be a cause of cooling relations - though I thing Britain would try to keep its long time ally.
Australia - with the 13 colonies staying in the British Sphere the need for a new place for penal colonies is not there - most (all) "colonists" will be shiopped to America (cheaper) where they will be used to push the border further west.
Some things I think are implausible:
John Churchill, Earl of Marlborough was "out" of favor with Wilhelm II and only later as a protegee of Queen Anne (thanks his wife) was given his OTL command. With the Oranjes still in power, I assume that the Churchills should not be back in favor in TTL (but its your TL of course)
1756 Treaty of Versailles - the French-Austrian Raprroachment fell together with a cooling of relations between Britain adn Austria over issues in the Austrian NEtherlands - those are already Dutch so there is no reason teh Brits and Austrians become Enemies - Though the better English Prussian relations might be a cause of cooling relations - though I thing Britain would try to keep its long time ally.
Australia - with the 13 colonies staying in the British Sphere the need for a new place for penal colonies is not there - most (all) "colonists" will be shiopped to America (cheaper) where they will be used to push the border further west.