The Brembo M50 calipers have the 100mm spacing, believe it or not, so you would need lower fork legs to make the switch. So the answer would be "not really" without spending more than you want, im sure.
I bought a set of used 330mm rotors for 119.00, on ebay. I needed caliper spacers to make them work, but no big deal. The bolt pattern and offset was just fine.
The 330mm rotor barely left space to slip my caliper on. It would be funny to watch me change them in some endurance race, or such. Seriously, there was 1 exact angle that worked. Bike had to be facing Meca....very difficult, and then they were on.
Another pretty decent set of Kawasaki/Brembo rotors is a set from the zx14 se. I bought a set of those for my concours 14. Same as stock (310mm) but they were thick...6mm thick vs my stock concours 14's 5.5. Those were also dirt cheap. If I remember correctly, 129.00.
