How can I use an AABB for collision instead of a capsule?

I’m trying to refine the side scroller (code) project into a prototype for my game, but I can’t quite figure out how to switch from a capsule root to a box root for collision. I’ve gotten as far as creating my own subclass of Pawn and mimicking the default Character class, but UBoxComponent doesn’t seem to have nearly as much functionality as UCapsuleComponent. In reality, I just want to use a simple axis-aligned bounding box for collision as opposed to a capsule; the actual path there doesn’t matter to me very much right now. I feel like I might be barking up the wrong tree trying to get ACharacter to work exactly the way it already does, except with a UBoxComponent.