I asked Yoyodyne.. they said no.
ISR custom facility, cheaper than you think. 4mm thick, full of holes, all good.
Between the GBmoto rear caliper and hanger (there is lighter and posher, but GB moto is the best bang for buck) the disk, drilling the rear bolts, re routing the brake line, filing the rear master cylinder, switching to aluminium clevis blah blah Well over a kilo has gone.
Now if someone has a spare 10 to 15 grand... I have an excellent way to spend it