Great interpretation of the Mambwe. For Baganda, I was thinking of taking those Foundry diamond-shaped African shields and adding a kind of pointy knob to the middle of them. Add those to some Foundry tribesmen with feathered headdress and it might be close enough. There are a few pictures of early twentieth century Baganda warriors on the internet. The shield seems the most distinct characteristic in terms of creating a miniature version. IIRC, the Baganda didn't like bows and arrows (coward's weapon) so leave those out. They did have some musketeers during Mutesa's time.