Bolt on cogs

Listen to the voice of reason in the posts above- if those same six bolts can stop me and the bike from 30mph using a 180mm disc attached to the hub with 6 bolts then no way are you going to tear a sprocket off the hub.

Indeed. If 6xM10 (or equivalent AF sized) bolts can hold back 500+hp of small block V8 clutch plate onto flywheel then I'm sure 6xM6 or whatever they are will adequately hold back any forces in play on a bicycle. I'd even go so far as to say that this bolt on setup is probably stronger than the conventional lock ring setup.