As I had stated above, evocation was not what we were going for, knowing ahead of time that simple bursts, jumps, and similar maneuvers were not in the bag. We knew we could do that. However, I appreciate the discussion on the finer points of the power. Thanks.
In the end we chose to use a thaumaturgy ritual and encapsulated it in an enchanted item at full Lore strength. We know it would have been exceedingly difficult to craft, but it was created during character creation. The end result is a ring that grants access to the wings power for one scene per session. We're using the wizard's base Superb Lore (+5) as the strength and counting it for his maneuverability or power in issues where such would matter, such as clearing zones, avoiding obstacles, etc. The player chose to put two enchanted item slots into it so it has 3 uses per session.
If there's any criticism on this, I'd like to hear it.
We are going for a 10 refresh game, if that modifies any opinions on this.