So I've decided to start a new thread for the SWOLT project and switch from the X9 capture to the SWE Technidisc.
The following three images are the result of applying UnDot, LUTDeRainbow, RemoveSpots, and DeSpot to it in AviSynth. (Note: Neat Video is not in use here. Moreover, I still have to tweak the settings of some of the aforementioned filters.)
These images are not manually touched-up: Sample 1 Sample 2 Sample 3.
The following image shows that this process doesn't result in much (if any) detail/quality loss: Sample 4. (Hint: look at the ridges on her blaster.)