Happy to see you try some slight changes in the game...
Maybe you could try create a Panafrican League representing countries without a league (this is the case a lot in Africa, and Oceania especially). Lets imagine you put an effort to ad the game to basketball followers in Africa (like sending messages/presentation of the game in social network from basketball federations, major clubs and so on). It doesn't seem crazy to catch the attention of 20 people in Ivory Coast, 15 in Congo, 10 in Angola, 10 in Cameroon...these managers could add their team in this league. You could try if people are ok about it (it could act as a beta test for other continents) to add one extra division in each champ, a superleague with all african countries, with current national division 1 becoming in fact a div II, so as you keep the national logic, and add extra competitivity with the superleague