Using compute shaders for postprocessing?

I’m quite new to the engine, so perhaps someone here could give me some advice. I want to do some rather complex postprocessing - better done through a compute shader than the material system, since I need to be able to have random access to the scene texture. Is there any “official” way of doing something like this, or should I just try to find a good place inside the rendering code (e.g. somewhere in FDeferredShadingSceneRenderer::Render) to add it to?

Thanks,