You can reduce render resolution easily, it's available as the unrooted ABD command `adb shell wm size 1080x1920`. You don't need a computer for it either, you can use an app like Bugjaeger to create a loopback connection on most Wi-Fi networks.

It's really not the same. Eink is a completely different screen technology that physically moves ink particles around. The screen doesn't emit light, only reflects ambient light like paper.

The point is to reduce your desire to watch addictive videos, not to do something with display technology per se. I actually considered that a startup idea - Android fork targeted to restrain addictive content consumption via artificially lowered refresh rates, some color filters and targeted software.