will they eventually become feral, pure blooded african bees, or will they remain a hybrid.
It is impossible that they will come "pure blooded African bees". They have got European and African genes. And when you go to africa, it a large continent were is all kind of bees and genes.
One gene pole is from Elgon Mountain Kenia. I have some Elgon bees . They are very normal to nurse.
South African reported that their feral African bees are not tolerant fo varroa.