The biggest issue with factions like Chiss and Yuuzhan Vong, is the species exclusivity, and I know that. I've run Chiss Ascendancy-s before on other roleplays, and it's hard to get them to last longer than about 6 months. That's why I've already spoken to some of the One Sith leadership, and the idea of a sub-faction was proposed. It'd be similar to the Vong's current situation, but I'd hope to keep some activity and incentive going within the sub-faction.
Having the CA be part of the OS would be a symbiotic relationship, where the Chiss get the protection, while providing a possible pool of Non-Force Users. I feel like this is the way to go with the faction, and it'd guarantee that it'd provide survivability once the interest inevitably drops down to a handful of people.
So, I think it's safe to assume that based on the opinions so far, that sub-faction is the safer bet, unless someone has a strong argument against.