Think about it a minute, kurt, you're asking for women who have a preference for strong, alpha, black men, to involve themselves in a relationship with a subservient, beta, white man. Unless you're filthy rich, you have absolutely nothing that attracts a white female to you.
This is like trying to sell a man a car when he's on the lot wanting to buy a pickup truck.
You might wish to consider being some white woman's sugardaddy ... she'll allow you to be seen with her on occasions as long as you're showering her with gifts, possibly even share a living quarters with you, but her body will belong to others. Another option would be to actually develop a personal relationship with a female, then at some point give her permission to see other people if she likes. It doesn't guarantee you'll be involved or even know of her outside relationships, however, and once she finds a strong, male of her liking, I'm afraid you'll be back at square one looking for another mate. Your desire is similar to that of a she-male, or even a cross-dresser, very frustrating at best.