Hunting for a display solution for my Commodore 64

My plan when getting the C64 was all along to make use of my old Eizo E67T VGA CRT that I kept lugging along throughout all my apartment moves for the last 15 plus years. It wouldn't be much nostalgia to slap on an LCD screen after all.
The problem was, the set I bought only came with an RF cable, the lowest quality solution to get video out of the C64. The AV port, though, has pins for both composite video and s-video with s-video obviously being the preferred option:



There's a ton of guides online on how to construct your own s-video cable with just about everyone suggesting to add a resistor on the Chroma line since the signal is apparently not up to specs, too strong, and modern displays would have trouble handling it correctly. I was going to order the parts from China and the guide linked above to make my own cable, but patience got the better of me and I ended up ordering a proper one off of a guy our Commodore Facebook group crowd suggested.
He used high-end connectors and even slapped on a ferrite core to cut out interference. You can generally find good options for $15~20 when searching for "c64 s-video cable" on eBay.

That was step one. The Eizo unfortunately doesn't have an S-Video in, though. Besides the standard VGA plug it has RGBHV BNC connectors but can't handle the 15kHz PAL signal and being in NTSC land here in Japan I had to stick with my Eizo. So I needed to get an upscaler. The online community apparently had mixed results with devices like the one to the right. An "svideo to vga" search on Amazon reveals a whole slew of these things, always the same case, always different branding and ranging from like 12 to 40 bucks.

I decided to go for one somewhere in the middle of the price range hoping it'd heighten my chances for success. It said to handle both PAL and NTSC and came with an OSD to select several different output resolutions/frequencies from 800x600 up to 1280x1024.

 That all didn't help and the result was horrible and completely unusable as you can see on the right. No colors as if it couldn't detect the PAL signal correctly and the still picture here doesn't do the brain shattering flickering it put out any justice either. So I returned it and went for the fancy 40 bucks option, a device produced in Japan with similar features but it certainly looked more high-end and didn't come in the same old casing like all the many other Chinese versions.
Being made in Japan, though, had absolutely no influence and the result was unfortunately exactly as useless as with the other. So back to the drawing board.

 Even though the seller assured me that the unit was tested working, it dawned on me that I never actually saw a correct picture coming from this breadbox. Could it be that the upscalers worked properly all along and that there is a problem with the VIC-II chip or some other issue with the machine itself?

Time for some proper testing then. Unfortunately, the cable I ordered only has an S-Video lead and all the LCD screens and TVs I have lying around the house only have the typical yellow RCA connector for composite video input. This requires some outside the box thinking...
Pin-out diagram shows composite on pin 4 and ground on pin 2. So, some alligator clips, 2 Arduino starter kit jumper wires and an RCA cable later and I had the Frankenstein construction ready to the left here. Then, lo and behold, on my huge LG TV via composite-in finally the nostalgic blue on light blue start screen I've so dearly missed: