I’ve been using the “Try! JLPT N4” grammar textbook on recommendation from a friend. It’s a decent book with a structure for me to follow, but I find myself frequently looking up more information/examples online or on Bunpro/Tofugu.
I am considering trying Bunpro as my primary grammar resource, but maybe after finishing Try! as I cram for the test in 2 months haha.
That userscript looks potentially game-changing in how our brains process kanji through SRS. I’m almost afraid to try it because of how impactful it could be for better or worse. But like you said, we are doing this to learn Japanese, not to read kanji in isolation. So it might be worth a shot.