The idea seems a bit dangerous, to all involved.
Things might go smoothly at first, but in the long haul, who decides what 'Black' is? What happens if one is of a mixed heritage, or has preferences that aren't 'Black' enough?
I say this because while growing up, my best friend was a frequent target off bullying due to this stuff. She is Black, but she wasn't 'Black enough' for other Black people. Her music tastes were different(she was mostly into heavy metal), and she wore goth style clothes. "You are trying to be white" was what she heard all the time. Her response typically was "You can't act like I color. I'm just trying to be me".
When any group segregates and excludes others, there is a potential for problems. It may start out with good intentions, but in the long run, it creates an atmosphere of suspicion and discrimination amongst each other.