Just a random idea that popped up in my mind, but…
What if we could just fake ourselves as a Curse User, by hiding our Magic Circles under our clothing and then casting it? The Magic Energy might be very weak due to the size of the Magic Circles necessary for hiding it under our clothing, and unless the Magic Energy casted from the Magic Circles destroys the clothing, then I think this is a pretty funny idea.
This was kinda planned in AA, you would have had magic circles constantly summoned on your back so you can shoot magic faster due to not needing to make a circle