MAGE: Magical Authority Guarding Earth

[Bryan]

I was looking at Spy Game, an espionage game using the 5e rules that looked pretty good to me. As I was looking at the character sheet, it hit me that it would be super easy to add another page to the character sheet, a spell list page. Let each player prepare and cast spells like a wizard of the same level but let them choose Int, Wis, or Cha as their casting ability. Use the hero points optional rule that has been around forever but in addition to what hero points usually do, let them act like sorcery points as well.
Bam! A 007/Harry Potter mashup that has the players involved in all manner of supernatural spy missions.
You could be in Faerie attending a ball because the Winter Court is looking to stir up trouble between Autumn and Summer.
You could be stopping a necromancer from turning a city morgue into a zombie factory.
Serpent People getting nuclear launch codes.
A dragon trying to take Fort Knox for its hoard.
Heck, just about any module or scenario could have at least part of its story adapted into a mission.
Is this as easy as it seems and sound like as much fun as I think it does or am I missing something?