It isn't the push-button setup that you've built, but PiHole is a decent option for this purpose as well. Occasionally I add social media sites (including HN)

It isn't the push-button setup that you've built, but PiHole is a decent option for this purpose as well. Occasionally I add social media sites (including HN) to the block list. It's very easy to bypass when I really want/need to, but it does cut down the more unconscious "CMD + T - news/redd/face - enter" moments that happen when I'm bored. Prevents the occasional unnecessary mindless scroll by creating a couple extra steps.