That said, these feel odd to me. I don't know, the idea of being able to select any combination of spells is off-putting to me. I feel like they should be constrained in some way; by school or discipline, perhaps, but that's still not quite the right feeling.
I can see that: there's not much flavor in them being open. But I don't think the feats themselves need to have those constraints hard-coded (at least flavor-wise): they're intended to be generic choices that can then be reflavored by GMs and players based on their concept for spells chosen.