I've had the same HE disk on my former r100gs. Combined it with a 4 pot calliper. The shear stoppingpower (well, for 2v-alikes
) Used the left side calliper from a r100r and just had to take about 5,5mm off the spacer. Easy fix, good result.
Now, by the time the disk on my G/S is worn and the 2 reserves after that I'll have saved enough money to buy the HE for G/S and so it'll be done.
BTW: it is just about floating, the lasercuts are in such locations that there is some room for the disk to move, just as on a really floating disk.