Challenge: Africa divided between pan-Africans and white neocolonialists

Let's say the unholy alliance wasn't just rhetoric but a formalized system. Let's start with an alternate Congo Crisis where South Africa, the Central African Federation, and the Portuguese support Katanga and South Kasai to the extent that allow the breakaway provinces to gain independence, and so recognize them. The Central African Federation later becomes Rhodesia in some similar form, and ruled by the same type of people. This group, buoyed with trade with each other, Belgium, and France (now with a more demented version of Françafrique due to the prior existence of a Pied Noir enclave based in Oranais), goes on to aid Biafra in a successful war of independence. And then maybe get involved in other conflicts in the rest of the continent, creating other allies, proxies, and so on.

This turns Africa into an international flashpoint on par with the Middle East rather than a place of (mostly) localized conflicts. Greater Soviet meddling to support pan-Africans and local African anti-colonialists. Greater Western meddling to support some of the white neocolonial states, but also to support some black democratic movements.

How will this play out? Obviously the various white colonial regimes will fall sooner or later, but when and how?
 
With the fall of the Soviets, US support dies followed by sanctions. How determined are the neocolonials to hold onto power? Because if they want to fight on they will be facing a gradual economic decline and the increasing rise of a police state that may support genocide to hold on. Of course I don't see them going full Nazi so at best I give them until the early 2000s.
 
How likely are any of the states I mentioned to survive? South Africa lasted as long as it did thanks to abundant resources and infrastructure both physical and social.
 
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