Create Custom Control Rig Base Class

Just posting this here because I’m not sure where to put it. I want to create a custom base class so all my control rigs have the same base functions to save from rewrites. After digging in the code the ControlRigHierarchyModifier class seems to be the place where these functions should be added. However there is no way to pass in a custom version of this class to a custom control rig class. Is this a feature that will be added when UE5 is released for production?