Omicron might have lighter symptoms than say the delta variant, but still carries the risk of long covid.

As someone who has long covid, please believe me when I say you don't want it.

That doesn't seem like a good idea. We won't have any solid data for a while, but it's likely that the immune escape works both ways. Just as immunity due to vaccination against/infection by other variants gives only limited protection against omicron, infection by omicron is likely to give only limited protection against delta etc. So if you get infected by omicron now, you'll still be at risk of getting hit by delta (or some derivative).

The idea that getting infected gives you immunity from getting infected is an interesting one: but the goal was not to get infected in the first place. Besides that, natural immunity as the result of an infection also doesn't last forever.

We still lack data on unvaccinated naive (if SA >70% seroprevalence are true), so at least omicron would serve as booster dose for vaccinated and recovered.