Custom collision geometry for skeletal meshes

I am in the process of getting my PC pawn class to work. It’s a robot that is put together in different pieces based on data. Right now it’s two SkeletalMeshComponents that get set at runtime.

The problem is collision. I can’t use the capsule, and simple runtime generation won’t work. I’m not using physics and so don’t want to use the physics assets.

What I really want is to define the collision shapes in Maya and import them when I import the meshes. But, this doesn’t appear to work.

A very simple case where I name a box UBX_hull (when one of my meshes is hull) - the importer sees it but it doesn’t appear anywhere.

TL;DR : Is it possible to define custom collision shapes in Maya for skeletal meshes?