I think I'm having a lapse in logic here (could be the number crunching for work and new NPCs), but isn't there a note that some effects of Evocation can be implemented via Thaumaturgy, just with longer times?
For example, altering the weather, having a lightning bolt strike a spot, applying force to a sattelite to crash into the Earth, etc?
I ask since I had an NPC performing a "ritual" to strike at a ship the party was on (they noticed it and disrupted it before it went off entirely), and the after effects consisted of green fire exploding out, some on the ship, a bunch to consume the caster. I was doing it as Thaumaturgy because I thought I saw that somewhere, but figured I'd check before my players decide to ask about it at next game.