Disassociating the choice of sponsor from the choice of sponsor ability seems like a great idea to me. Want to play Hutama with better covert ops? Sure, why not? Hopefully, it isn't hard to mod (just remove the ability from the sponsor and add a new seeding choice for the ability only). It isn't known if it will be easy to mod in more total questions for the seeding, or just additional answers to each question.
Separating the sponsor and the ability also make modding much easier - people can add in new sponsor abilities without having to worry about the sponsor assets to go with it. If you did this in civ 5 by creating new UA and just giving it China's assets, then you have the possibility of two people playing China which is weird. Making the sponsor and the ability separate choices in seeding fixes that nicely.
I don't see much benefit in breaking the sponsor abilities down further as they are already fairly small bonuses. But, the idea of picking more than one choice from each seeding category is not bad.