I might have ask Lee to head up Reconstruction as well.
That would have been wonderful, but the RR's would have never allowed it.
Lincoln might have pulled it off and Lee freed his slaves in 1859 and was aware of the problems with trying to integrate them into Southern society.
There were actually good examples where it was done in the local community. One thing, which everyone forgets, is that a lot of the former slaves were the children of their former masters. In some places, even after Reconstruction ended, that was recognized.
Or, as I like to say, in the history of the US, race has never been black and white.