Sadly it looks like Google/Youtube have now circumvented Ublock again. After implementing the changes you suggested above, it got rid of the pop-ups on Youtube for me for a week, and now they’re back and I can’t get around them even after updating Ublock. Hopefully Ublock gets around these quickly.
I’m sure that it’ll just be an ongoing battle between Ublock & Youtube both updating themselves to get around the other. I’ve transferred over to watching more & more on Nebula as it’s better for the creators, ad free, and way cheaper than Youtube Premium.