Which you don’t need to do anyway because “[r]eplacing traditional seeds with commercial varieties is not an official government policy,” at least in South Africa. Unlike in the EU, I guess. Oooooh, did I just say that? Such a naughty muppet.
Ok, let me make up for that with some thoughts on breeding for the sorts of places where those traditional seeds might be found, in Africa and in Europe.
Of course, in such places, you have to know your aphids. Before they go and eat a bacteria and change their DNA. Tricky to breed for resistance to that, I would guess.