Would be great if zero offered the diginow as an optional replacement instead of Calex for new bikes and as replacement part for faulty chargers. Would be win win for both companies.
Diginow should also look at selling a mount for replacing original charger location.
The Diginow SCv2 does not have certification for worldwide sales by a motorcycle manufacturer, and doing so is very very expensive in money and time. Not going to happen from Zero Motorcycles. The best that Zero Motorcycles can do as a company is to improve their bike design in battery, cooling, and mounting options to make it easier for aftermarket.
There's a few people who hacked up their Zero bikes (S, SR, and FX) with mounts for the SCv2 systems in place of the onboard charging system; This involves necessarily to void the SCv2 warranty with Diginow because of size and thermal limitations.
TL;DR we're not likely to see any bolt-on charger replacement for at least a few years. Meanwhile you can get a two-module Diginow or Evtricity setup that is compact and travels well.