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Might consider IBonds... Current variable rate is 2.76%.
Depends on the guess about what the future holds for inflation.
Understanding how IBonds work is important. The safest part is that the return can never go below zero.
I Savings Bonds - I Bond Rates - Maturity Dates - I Bond Values - SavingsBonds.com
I agree that this may be the best solution to your quandary... It does address a lot of your concerns, is fairly liquid, inflation protected, and no fees......it was my first choice among the solutions presented.