> But for healthy "essential" workers it would mean not living in fear that they might get it... because they already got over it.

Coronaviruses don't tend to produce strong, long-lasting immunity, and we have no evidence that SARS-CoV-2 does, and, also, young otherwise healthy people are dying from strokes that seem to be due to the virus: https://www.washingtonpost.com/health/2020/04/24/strokes-cor...

So, this would be both high-risk and of dubious utility even in the case where significant adverse effects didn't occur.