Custome Geometry Brush

Hi,
I have a BP with a Static Mesh component and a Box Component acting as trigger. everything implemented in C++.
To make it easier for my Designer to Build the map i would like them to be able to edit this BP as a BSP, I’ve tried inserting a Brush Component inside but couldn’t get how to use it, and also i made my class inherit directly from ABrush instead of AActor. but still can’t edit it.
Any idea on how to approach this issue?