My idea was just a suggestion on how to butterfly away the casus belli of the American Revolution, the unequal treatment of the colonies' population.
I understood this. That’s why I explained that ending what you call unequal treatment was contradictory with the very reason Britain established the settler colonies in continental North America.
Britain did not establish these colonies to have them become competitors that would snatch the colonial markets away. The goal was to have these colonies as captive markets for British manufactured goods and for colonial products imported from other areas of the globe by British merchants, and to have these colonies as purveyors of raw materials for Britain. The goal also was to get rid of populations that had become undesirable on the motherland.
So as the Romans did, the solution could only have been the American elite/aristocracy being brought as a very junior partner into alliance with the British aristocracy and the British ruling class.
Britain did not want to be satellized by a colony that was growing so fast that it would dwarf it in a century (OTL the US demographically caught up with Britain in the 1820’s).
Britain did not colonize North America nor fight all the wars it fought to have its political and economic center displaced in a very distant unpopulated continent that was isolated from Europe and Asia by 2 gigantic oceans.
Mackinder’s strategic realities did not emerge in the late 19th century. Eurasia always was the economic and strategic center of the world, the most populated and richest part of the world, except for a parenthesis between mid 19th century and late 20th century.
As soon as Europeans were able to project power on a long range, they wanted to go for India and China. Columbus and the other sailors sponsored by european monarchies wanted to plug themselves with the Indian and Chinese giants.
Not for Americas. Americas were discovered by chance and, had the Spanish not found Aztec and Inca gold to plunder and Mexican and Bolivian silver mines to exploit, there would have been even less incentive to target this area of the world beside India and China.
Britain will rather severe political links with its North American colonies than being attracted away from the core of world affairs by these colonies. But before coming to such extreme choice, it will do whatever it takes to avoid being forced to make this choice : divide the colonies in order to keep on ruling them the way it wants to rule in order to keep on concentrating on its vital interests.