There’s a very good reason why Julia Nunes went for a chord-based version when she covered this tune – the riff is a nightmare to play on uke.
It’s not in the same key as the original and slightly adapted. I’ve used harmonics for the notes at the 12 fret to buy a bit of time but you can just fret them normally if you prefer.
I found it more easier and even more accurate (for my ear) to play it:
|———–10—–12—–10—–|
|——–7——7——7——-7-|
|——————————–|
|—-0—————————|
And so on with other parts.:)