Expand Harmonize to Match Texture Between Two Layers

Harmonize returns often-impressive results when both layers are photographs and each photograph has a similar level of detail, sharpness, etc. 

It would be extremely useful if Harmonize could match the sharpness / blur / texture and other non-color characteristics between two layers.

As a very silly example, think of adding a current photo of Paul McCartney to the cover of Sgt. Pepper's. Even though Harmonize will match the color and lighting, the comp is still going to be obviously grafted, since the photo won't have the "industrial printing on album cover cardboard fifty years ago" textures and imperfections.