It’s unfortunate that this is an actor wide setting, because the only other component I have is an “editor only” component that happens to be a billboard (which then can’t be a scene root).
My workaround was to set billboard scale to 0.01 and then the scale of the billboard component to 100.
A small issue is the z-fighting that occurs between the default root and your billboard, but at that size it can be ignored (or as I did, moved the billboard slightly, which does mean that you get a white pixel in the middle of it from certain angles).