Most people in actual retirement I know do something like keep ~2 years of cash in short-term treasuries and everything else in equities. That gives you a lot of buffer to time-shift equity drawdown, which is the main risk with equities, while retaining almost all of the benefit of equities. Simple and relatively robust.
What you propose takes on a huge amount of inflation risk. How are you hedging that risk? A guaranteed yield doesn't mean you aren't getting poorer. Obsessing over one type of risk and ignoring another isn't rational.
Reducing variance of net worth has a very high cost. Over-indexing on that singular property, particularly when most people can afford some variability, is a recipe for relative impoverishment.
not if you're 80 dude...