Deoldify Vapoursynth filter

[Selur]

Case 1&2: should be covered by Hybrid as it is atm., correct?

Case: 4, I added this case to be able to quickly adjust the colored movies with the previous version of HAVC, in this case is not necessary to recolor again the clip.

What? Please rephrase that.
Did you want to write:

I added this case to be able to quickly adjust the already colored movies, which were colored using the previous version of HAVC.
In this case, it is not necessary to recolor again the clip.

If that is what you wanted to say, then this should be a separate filter in Hybrid (not a option of HAVC_main) which should be called using for example with something like

clip = havc.ColorPostProcessing(clip, tune=.., mode=...)

.

Case: 6, is similar to case 4, but in this case BlackWhiteTune will be applied using the process described in Case 3.2

If this too is meant to be applied to improve and stabilize an already colored clip, then this too should not be part of HAVC_main.
The ColorPostProcessing, should be extended to

clip = havc.ColorPostProcessing(clip, tune=.., mode=..., stabilize=True)

.
(side note: such a filter would be located under Color->Misc not Color->Coloring in Hybrid and maybe named 'ColorImprovement(HAVC)')

Case: 5, is similar to 6, but in this case the stabilization parameters will be taken from the GUI.

Okay,.. then you should extend ColorPostProcessing with the necessary options.

Case: 3, This is a complex strategy (which requires at last a RTX 4070ti) which split the color processes in 2 steps:
1) in the first step will be used HAVC with Deep-Exemplar and freq=5, just to speed-up the first coloring step (BlackWhiteTune will not be used in this step);
2) in the second step the clip previously colored will be stabilized using ColorMNet, which provides dull colors, and will be applied BlackWhiteTune to improve the final colors

Sounds to me, like this should be: done with two filter calls (user enabling two separate filters)
1. 'HAVC' (havc.HAVC_main(...))
2. 'ColorImprovement(HAVC)' (havc.ColorPostProcessing(...))

Cu Selur