Yes, that is what i had in mind . Looking good. Downside is, it misses top and bottom. That is only solveable with the shader itself. A little more love, it would be perfect for such a task.
Maybe Moogly will have same mercy on us Would be really cool to see that solved. Ideally the pillarbox fx would be a mirror of the sides, top and bottom, to make it even more realistic. Currently, it is just a copy (not mirrored) of the sides.