The biggest distraction for me, when working/focusing, is movement at the edge of my vision. You know, like most websites with their moving ads, or fly-out videos that no one asked for, etc.
I'm glad you found your silverbullet, but that specific approach would wreck my productivity.
Your description is close to what I experience at times, that blinking thing may help you ignore outside the monitor distractions as it is there forcing you to ignore?
Interesting,
Do one and tell me ; )
I cost me $25 or less.... all spares ESP32 (most of them has a LED pinned anyways) and don't bother the heart monitor initially, just set time and rate of descent for the blink.
Cheap test...
I may try this, as an experiment, but going into it, I'm expecting a fail. If I do try it, I'll follow up.