I can't see a drill bit breaching section 11. It is unlikely(?) to weigh more than 20% of the overall weight and no drill bit (that I know of) is bigger than 500mm diameter. What you might need to consider though is rule 12.4, which says no hardened steel blades that may shatter. It has saw blades in mind (RW series 3 Pussycat) but I can see that being questioned. I'd also bear in mind 12.5 which is to do the length of commercial blades (max 20cm).

Of course, interchangability on the drill bits would work around any potential issue here, you should be OK.