WI: Earlier Mâle?

In Jonathan Edelsteins outstanding timeline Mâle Rising a group of revolting slaves are send to Africa because the brazilian authorities don't want to deal with them. In Africa they build a new state based on republican ideals and ban slavery. What if a group of revolting slaves gets send to West Africa in the 18th century. While I don't think that they would set up a republic they could outlaw slavery because their experience in America. How would a West African state in the 18th century develop if slavery is outlawed and how does this change West Africa if there's a reason to outlaw slavery?
 
I think that the Male were influenced by revolutionary ideology (specifically Haitian I think). I would suppose that any "freedman state" in Africa before the French Revolution and its Haitian front would more likely go the Liberian route of accepting slavery in principle. My understanding is that Brazilian quilombos, the closest historical parallel to your scenario I know of, usually practiced slavery as well.
It's not easy to create a seriously working liberation ideology, esp. in that context.
However, there's a lot of room to speculate here. An African equivalent to quilombos would have pretty huge effects even if not militantly abolitionist.
 
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