I've actually been contemplating a Laurens TL. His anti-slavery stuff makes him fascinating, and he might have also had an equally profound impact on Hamilton. They were incredibly close, and I wonder if Laurens--who proved in some later versions of his freed slave regimental proposal he was starting to play the political game--might not have helped make Hamilton a better politician. Also, Laurens, as former minister to France, had diplomatic experience. Given that he was on Washington's staff, it's not crazy to think he could have been Sec of state after Jefferson and Randolph, or even minister to Britain in loo of Jay.
John Jay is another good one. And I've always been fascinated with the Mullenberg brothers, Frederick and Peter