I'm good with the stock gearing. I see no need to raise it to lower Highway RPM.
I'm not trying to insult anyone here but, if you think the N1k has too low highway gear, you need to go ride any of the supersport bikes of just about any displacement. Seriously. Start with a 600cc. Let me clue you in: The first number of your speed will normally correspond to the first number of your RPM.
Look at it from another perspective. The N1k is NOT a Concours 1400 nor a Goldwing. It's a Ninja, which morphed from the Z1000 naked sportbike family, which in turn is just the bigger brother of the ZX10R supersport.