Is it possible to use a single function for OnRenderImage AND [ImageEffectOpaque]OnRenderImage?

I'm working on a chain of post processing effects where there is a lot of shared data and behaviour between each of the effects.

The design that makes the most sense for my project is to have a single MonoBehaviour for the user to interact with, however I don't know of a way to have something along the lines of:

 class EffectsClass : MonoBehaviour {
     
     //opaque pass
     [ImageEffectOpaque]
     void OnRenderImage(RenderTexture source, RenderTexture dest) {
         // .....
     }
     
     //final pass
     void OnRenderImage(RenderTexture source, RenderTexture dest) {
         // .....
     }
     
 }

To get around this for the time being I have two additional components added to the GameObject: one which calls the Opaque pass, and one which calls the final pass.

If it's the only solution it'll have to do, but is there a better way? It feels dirty and unintuitive to new users.

Maybe there's some way of manipulating attributes, or some other C# trick that I'm not aware of?

Thanks!