No.

They can't interrupt the summoning of magic. They have to be able to tap directly into magic, which they cant do. You could redirect energy elsewhere once the spell is transmuted into a regular energy you could move it around, but you cant stop casting or arcane magic.

Also using magical energy isnt that simple to use. It requires complex machinery and systems to convert magic into electricity, they mainly use Fusion reactors and a few DE reactors with maybe one or two magical components. Magical systems also require highly trained operators.

Using magic in any significant requires a fuck ton of training, most unicorns who dont enter the military wont anything beyond levetiation.

Also magic isnt even used by Faust, she could but she has better shit and it was something she created for the Equestrians.