But in 1787 there was no possible way for Brits to "change their minds" about US independence, since they had already fought & lost a six year, very expensive war to prevent independence.
And with the French Revolution threatening, Brits were in no condition economically or militarily to take on another war against Americans in 1787.
Rather the need for "a more perfect Union" was clearly demonstrated by factors much closer to home, including:
For starters...
Well, that’s enough fun-time for me for now.
Now it’s back to work for a few days.
Enjoy!