As said before, all would have been depending of the terms of the Defeat of the Insurgents. And would have been the terms for peace with France?
The King George was able to sign with the new USA a separate Peace Treaty, but if the US side would have been defeated, the UK would still have to deal with France.
To carry on the war would have be a menace for India, when the French were doing good progress. The Louisiana was still French, and Louis the XVI, unlike his grand-Father Louis the XV had interest in over sea territories.
We can imagine the leaders of the Insurgents, shipped to France or to a French territory, creating a Provisional Government, and starting a guerrilla war on the British, sending spies and agents in Quebec, recently occupied by the English with French courreurs des bois along side American rangers sneaking through the forests and cutting Red Coats necks…

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