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We're just waiting for harmonisation of a splined sprocket which can accommodate 13T for track racing. For most people, ISO 6-bolt is fine, but racers wouldn't like having to use 64/16 for pursuit gearing, even though it might actually be a good idea. Shimano HG is the wrong shape for reversing loads (sorry Halo FixG), but CentreLock is sized appropriately, uses standard road bike servicing tools and AFAIK is free to use.

Surely then a more svelte version of the Splined Drivers that FGFS hubs use is then the answer?