South Africa is possible if gold is discovered much earlier, which would draw in enough people to make alternative industries also develop, and eventually a critical mass would be reached where it became a destination in and of itself like Canada or Australia. Namibia is a desert, so I'd say likely no, but a longer lasting Kaiserreich or German Victory in WW1 would help. That, or if we want to get creative, a second Great Trek of sorts from the Afrikaner people, in reaction to a huge upscale in British colonization stemming from an earlier Gold Rush, and the annexation by franchise of the Boer Republics. The same would go for Algeria. If France loses either World War, expect a significant increase in immigration from mainland France. Rhodesia could see significantly more immigration if economic conditions in Britain are much worse. Kenya, likely not. Kenya also suffered from a pretty nasty group in charge of its colonization effort that alienated newcomers and often led to them leaving for other places, in addition to stirring up unrest from the natives, which also dissuaded settlement.