Jewel of the North
In my version, Sorcerer and Bards get to select spells from any Sphere, but they have a limtited access the 8 schools.No reason there shouldn't. Right now, WotC has already gone ahead and done the divine version as just a Sorcerer sub-class, though. And it might be cool if the sorcerer were "just magic," without the strong Divine/Arcane/Primal divied.
Sorcerer: Necromancy, Evocation, Transmutation and Abjuration
Bard: Illusion, Enchantment, Conjuration and Divination