I am not really sure on what countries in Africa are applicable in order to embrace bitcoin as an alternative currency, with respect to their economic status and land point. Considering that most countried in Africa are suffering and are categorized as an underdeveloped country, they cannot adapt a digitalized form of payment wherein most of their population does not have access to the internet.
If the government plans on embracing this system, they have to prioritize this over other practical means like infrastructures and technological advancement reforms. I highly doubt about it anytime soon