If you check out this video
https://www.youtube.com/watch?v=wSqT_PeiV0U of the man himself, his fingerwork is fairly self evident in the intro. He's got his capo up on the third fret, so not that much lower than a ukulele in "normal" tuning. You might find it easier to have your ukulele set up with a low-G rather than re-entrant, in fact, if you tune your ukulele ADF#B you'll be in the same tuning as the video :music: