I’m not sure if the 2020 changed drastically from the 2017-19 in terms of where things are laid out under the hood, but on my 2018 I didn’t have to touch the fairings to swap headers. Granted it probably would have been EASIER to do it with the fairings off, but may not be necessary for the 2020 either.
In any event, in case you can’t find any 2020 specific info, maybe this video on the ‘17-19 can put you on the right path to fumbling through your own removal:
A forum community dedicated to all Kawasaki motorcycles including the ZX-6R, KLR 650, Ninja 250, Ninja 250R, and Vulcan. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!