I agree that a UBI--which I understand to be only a supplemental income, not one a person could live on--is a nonstarter both politically and as a matter of economic reality.

On the other hand, this might be of interest: a guaranteed minimum income that would not be paid to every adult, but one for which any adult citizen could become eligible. Money would be created as needed to fund it, but with built-in protections against inflation. It was developed independently of MMT (Modern Monetary Theory), but connects (in a way) with it.

if curious: "Two Possibilities for MMT" here in Medium, but not behind the paywall