I can't answer your question but I would dare to say that the height you would be able to gain by doing such a thing is absolutely negligible and wouldn't make a difference to how much you can or can't put your feet down.
Plus that thing ain't comfy to start off with, I wouldn't dream of imagining how my butt would feel after a 150 mile ride on that thing!!!
If you're really interested in a ZX-6R and you feel up to it, I would just one-foot the thing and be done with it :smile: