Not going to happend being governor of a far away island is one thing becoming Marshall of France is a whole other level. Racism of the time would not accept that.
Actually, I disagree.
There were multiple Marshalls at any one time, and if Revolutionary/Napoleonic France wanted, they could have appointed T l'O "Marshall of France in charge of all military forces in the Americas" (which would have been Haiti, a couple of other islands and a handful of militia in Louisiana, perhaps. Since France couldn't project (much) power across the Atlantic, anyway, giving a glorious title to some black guy and then using racism to blame him for subsequent losses, seems entirely plausible, IMO.
It would, of course, have been a meaningless title, and one they would revoke if he actually ended up surviving
NB: this is a darn low probability scenario, but not, IMO, ASB. T l'O being a Marshall in Europe probably is ASB.