Question How to inject custom UI elements into existing IMGUI editors?

Is there a way I could inject or modify UI elements in built-in editors, such as the Transform component?

Here's a mockup adding some button icons and a color overlay as an example:


So far, the only way I have found is to create my own custom editors for each component type. This essentially replaces the built-in editor with my own version.

Code (CSharp):

1.  
2. [CustomEditor(typeof(Transform))]
3. public class TransformOverride : Editor
4.  

The problem with this approach is that it replaces built-in functionality and is too likely to cause problems or change the behavior from what the user expects. It would also be a lot of work to do this for every component type.

Is there some other way I could draw over the inspector and use reflection to detect property fields? I'd want to do this for all components on the object and inject UI for any compatible fields.