Maybe to resurrect this thread for options post-COVID: Ideally I would like to visit both Seychelles as well as Zanzibar,or perhaps Mauritius, on a RTW ticket, DONE.

For my entry into Africa, I'm open to either travelling from either Hong Kong (to Doha?) or Perth/Sydney (to Jo'burg or Doha)

It seems that as Doha is the only stop to Seychelles, so I will be limited: Air Maroc doesn't get that far in Africa (nearest stop would be similar to Angola). As such I'm probably stuck with a surface segment to then connect to one of these flights:
1. Mauritius to London
2. Addis Abba to Doha
3. Johannesburg / Capetown to London or Doha

Is there anything I've missed as an alternative option (Seems oneworld has killed the interactive route map so I'm using a free tool).... I guess my "surface" segment would be using Ethiopian Airlines to get between the two... Perhaps in this case I should consider star alliance (note am a long time 10+ years OWE so would prefer to avoid this as without these flights I likely wouldn't renew that status)
Edit: Ok, I tried the Star RTW tool and discovered that it is no better since this rule, more restrictive than OneWorld, "maximum of 1 stopover in any single city", and the tool seems to be including this as a transit, so that means Ethiopian Airlines wouldn't let me transit more than once in ADD, so it is pretty much the same outcome.