I like the concept, but it seems one consequence is a smaller pad:
Note: The AP Racing strap drive disc assembly requires a shallower pad than the original pad to enable them to clear the strap drive system. The pad depth is 50mm as opposed to 60mm on the standard pad.
Obviously, the pad is still big enough to get the job done, but giving up 17% of your pad area seems like an unfortunate compromise. I wonder how common it really is to see debris clogging up the bobbins typically used in floating hardware, on street cars.