It isn't outdated on track. 7710 is still one of the most popular configurations. It is also an easy upgrade path for power meters on the track as well. I have a 7710 with a stages power meter. Used it for the past year in all sorts of conditions audaxing. Still on my first bottom bracket and it's still silky smooth, no bad for outdated tech.Octalink was certainly available in different sizes, but I think you're barking up the wrong tree by looking for a solution to all this by pursuing an outdated technical standard which is long past its sell-by date (by about 10 years at least).