[HELP] Deblocking filters requested for HD version of XÍCH LÔ (CYCLO, 1995)

[Oldermediaformats]

I have a 1080p file of Trần Anh Hùng's Xích lô (Cyclo, 1995) that I would like to apply de-blocking to. The 123-minute feature has been compressed to 4.4 GB so I'd like to get as much blockiness out of the image as I can. Actually, compression artifacts aren't too bad. By glimpsing at the first reel, which of the following filters and settings should I try:

VapourSynth

1. Deblock
   
2. DeblockPP7
   
3. Deblock_QED
   
4. DPIRDeblock
   

AviSynth

1. Deblock
   
2. DeblockQED
   
3. amDCT
   
4. DeblockPP7
   

Also, do you think any debanding could be needed, too?

[/url]Here is the file:

[url=https://drive.google.com/file/d/1b4WF7AgGh5UIkahNtU9PXxfsA5oc24b2/view?usp=drive_link]https://drive.google.com/file/d/1b4WF7AgGh5UIkahNtU9PXxfsA5oc24b2/view?usp=drive_link