Honestly, I thought this was impossible. It doesn't sound quite right since the kalimba doesn't have off-notes, but I tried.

I really wanted to preserve the two voices and the violin all at the same time, but two fingers aren't enough to play 3 'voices' at the same time. The first chorus is adjusted to be playable, but the second chorus is not (so you can hear what I hope it to be). If someone else out there is actually trying to learn this song, just learn the first chorus and ignore the second version.