My gift to the kalimba world is kalimba tablature. It is expressive and elegant. It can display any sort of music, and it reflects my internal conceptualization of the kalimba and its music.
However, not everyone likes my vertical tablature.
If the tablature is too much for you, you might want to try the Numbers-based approach. Yes, it is "Play by the Numbers" - but it really isn't very far off from one of the ways I think about and understand music.
This is a perfect place for young children to start playing kalimba.