Very sorry to her your card is performing so poorly. To answer some if you questions. I honestly only see them acknowledging the issue maybe if some big YouTuber or a number of them reports in the issue.
Yes, im sure you could open the card and it would look fine to the manufacturer, but I’m 100% sure they would be able to tell just by looking at the replacements.
These are the pads I got: https://www.amazon.com/gp/aw/d/B08GSD1QDY?psc=1&ref=ppx_pop_mob_b_asin_title
The ones I was able to get were 6w/mk. That was the highest I could get at the 3mm thickness size. Obviously the higher the better but you will have to do some more research(someone in the comments posted a link to 12w/mk pads o eBay)
Basically the 100x100 surface makes the pad a square , so when you decide to cut the pieces you will have a lot more freedom than a 100*20 since you are limited on the 20 side. For the card I used the 100x100 almost entirely on the back, very little waste. For the 2 mm maybe about 50% of the pad. And for the 1mm I used it completely(you could actually run out of it) so just to be safe I would order a 200x200 because the 1mm one is all very long strips and there is like 8 of them at least.
You can check the link here: https://www.amazon.com/gp/aw/d/B08GSD1QDY?psc=1&ref=ppx_pop_mob_b_asin_title
There you have the different thicknesses and also the 100x100 and 200x200 Versions