Thank you for the detailed post.
Interesting stuff. Also decidedly different from several West African myths in some respects, though I expect some commonality. Machaka does have some of the dark Africa things going for it, but a lot of the things in it fit that plus a mixture of West African mythologies.
I must admit that my reading on those is rather cursory. I will try to find the time this week to look into the things I have previously perused and analyze them in more detail, because the effort you went into deserves a response in kind.