How to only enable rotation in the editor viewport?

I’m designing something at editor time for other designers to use. I need to ensure that they can’t use the transform gizmo to move or scale an actor in the viewport; only to rotate it. I want to avoid the Scriptable tools as I can’t guarantee that designers will always remember how to utilize this feature.

I basically want to either always lock the gizmo into “rotate” mode, or remove the location / scale gizmos entirely. I plan to use a detail customization to hide the transform input in the details panel as well.

If anyone has any idea how to do this or where to start looking, I’d appreciate it. I tried to figure out how to register a new gizmo with the editor but I’ve fallen short. Any help would be appreciated.