I was checking out a magic mod called Lost Grimoire SSE and messing with some spells that allows you to transform into certain animals. I also have Wintersun in my load order, and it all gave me the idea of a patch between Wintersun and certain vanilla and modded magic spells to lock some of this stuff behind a diety's favor. An example, some of the spells from Lost Grimoire or Natura being locked behind being a follower of Hircine/Kynareth, or certain Restoration spells from vanilla/mods being locked behind being a follower of Stendarr, Necromancy being locked behind being a follower of someone like Mannimarco.
The idea would be certain specialized magic would be locked behind being a follower of a specific deity, while also having general magic that anyone could use.