“Fair enough.” It would be easy enough to sneak upon the man, catch him alone, especially since Loki wouldn’t have to be physically present. An illusion would do for spellcasting purposes, or even a simple and brief consciousness projection. The trick was making the change inconvenient without rendering it meaningless.

Alone, that was the key thing. It wouldn’t do to change him in front of Thor or one of the alleged children. “Surprise is generally a solid tactic.”