Oculus Mirror with Post Distortion AND Other Settings?

Okay so Im trying have whatever is being displayed on my ANCIENT Oculus DK2 headset to be displayed one for one on another display (or really 2 halves) but at a higher resolution. This means I need both the distortion and CA correction to remain, but it needs to be running at a higher res. I figured the easiest way to do this would be with Oculus Mirror. I have no issues running it at a higher resolution using the basic "--Size 2160x2160" command in CMD combined with just bumping the Pixels Per Display Pixels Override to 4.5, however, according to the docs,  it is not possible to run both Post Distortion (using the --postdistortion command) and change literally any other settings. Now, on top of this, Post Distortion doesn't seem to be keeping the CA correction, but that's a smaller issue.
Essentially, I don't seem to be able to have the distortion effects at the same time as a higher resolution in Oculus Mirror. Does anyone know of any things I can try to get around this or simply another way I can achieve my goals without Oculus Mirror?