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Its been a bit weird to me that all the chaos gods have SC heralds, but when it comes to GD that Slaanesh is left in the dust. Are there any noteworthy KoS in the fluff that could fill in as a SC? How would this SC be different/unique from vanilla KoS?

N'kari is the only Keeper of Secrets that comes to mind, its mentioned in the time of legends "A tale of the sundering" books. Pretty sure its one of the Daemons Aenarion defeated during the ritual to seal chaos from the world.

Not sure what kind of special rules you would give it as there is not a lot of info on the daemon.