Cleaning old 640x480 AVI clips

[Al74]

Unfortunately, the noise is everywhere on these AVI clips so I am not sure if masking is a good idea. Once you have recommended such an approach to use for MTS files in which the noise was mostly present in bright areas like the sky or water. But these files and also 4K mp4 ones will be the topic of other threads.
I have tried the settings you recommended for these AVI files:
DeHalo: YAHR, Blur 1 and Depth 16
FineDeHalo: Default
DeRing: GLSL AntiRing defaults.
Question 1: Does FineDeHalo remove the halo effect even more?
Question 2: What does the GLSL AntiRing filter do?  Is it responsible for the removal of some rings and jaggies from the clip?
All in all after this stage, I have tried the following filters:
1. MCDegrainSharp, Strength 3, Strength (sharp) 0.1-0.2, Strength (blur) 0.3, Threshold 400
or
2. Temporal Degrain Filtering level - pre and post-filtering step, other settings default; + SMDegrain Temporal radius 3, prefilter off or dfttest (spatial); this is Temporal Degrain AND SMDegrain together. It removes most of the artifacts, colours noise, etc. leading to quite clean footage without creating wax-like faces, etc. I must play with a few more settings to find out "the best" ones. Assuming I shall succeed, the next stage will be upscaling, maybe NNEDI3.
A few examples will be shared during the weekend and some comments/suggestions will welcome.