Good point. Interestingly, it can be purchased from Bikegang or Brommieplus at about half the Kinetics price, with a modified chain tensioner. It's not customised, comes in the 120 mm over-lock nut-distance version and without the smaller chainset, but I just checked, my rear triangle is 113 mm wide as it is, stretching it by another 7 mm seems doable.

Not sure I'd be happy with the extra 700 grams, but it is a very interesting option.