I don't remember all the details off hand, but the British were pretty good at divide and conquer techniques. One of the reasons the French lost Hispanola is because they lost the support of Creoles (Black/White Admixtures) during the Revolution, who'd traditionally provided the backbone of their local physical strength. The British were only able to hold on to Jamaica against enslaved Africans majorities, as a remember, because of the Maroon and Creole support. I suppose the true answer for British conquest of Haiti is to somehow win over the Creoles, and on top of that create a Maroon like faction on the island among Africans. How likely is that?
What do you mean by créole? Do you mean the mulâtre populace? The créole (criollo/white) populace was expelled or massacred during the war...