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There is a Flyertalk forum specific to oneworld travel and that's a good resource for this and oneworld RTW ticketing too.
For the incorrigible travel dreamer (self included) the Flight Schedule / Where We Fly section of the oneworld.com website is a good place to start, using the Sort By Stops option. And this shows, in addition to BA, Qatar's service from Nairobi to Doha, and Kilimanjaro-Doha. South Africa / Zimbabwe / Uganda / Namibia would give other options.