Copying a region of the final rendered scene to the screen or a render target

I am needing to copy a given region of the rendered scene (before UMG draws) and render the copied area back to the center of the screen. See example below.

Original Scene:

Scene with copied region:

Does the engine support copying a region of the final rendered scene (after post process, but before HUD/UMG) to a render target in either blueprints or C++? Can this be achieved via post process? I’ve tried using a capture camera for this effect, but there were far too many inconsistencies in the way the capture camera rendered the scene compared to the main viewport (gamma, HDR/LDR issues, transparency ordering, etc).