Oh, I see now there is an issue with Susannah and racial issues.
I don't see that as a problem at all. Detta/Odetta didn't see things as they were, she saw them as she thought they were. She could easily see Roland as white and she could easily behave in exactly the same manner. Because it was never actually about Roland, it was always about herself. I don't see there being a need to change anything. I see this as being very simple.
And welcome aboard this crazy train!