Why? cause it should work the best without too much modifications, also their special edition already comes with a schlumpf but quite costly also it's a pretty sturdy little folder with minimal flex. I found it pretty stable when I was maxxed it at 30km/h, the only concern would be the bottom bracket that it's mounting to cause the existing one is modified so you can correctly tension the belt.

This mod would mostly benefit from flat lands for a higher top speed mostly. uphills you'd be using it the lower 1:1 ratio gear anyways. But at a price of around 650 USD, i'd rather skip it and look for a more cost effective alternative probably another brand. Not sure if such a thing exists outside of schlumpf hopefully something under 200, just hoping