There is another way to achieve the goals stated in this excellent article. It follows explicitly from mutual respect as the ethic of justice. (if curious: "Beyond Liberalism" here in Medium, but not behind the paywall)

A requirement of mutual respect follows from a belief in equality, but, even better, it is an 'ought from is': it follows from the observation that human beings have no choice but to effect choices: choose among perceived alternatives and take action to bring that choice to fruition (which I got from Warren J. Samuels).

In terms of economics, this approach would involve a "democratically distributed income." It would not be a UBI, but would be a guaranteed minimum income. The money for that income would be created as needed. It would form the (completely self-regulating) supply of money (as currency) for the economy. It would make the economy as a whole fully self-regulating. The same process could be used to fund all government, eliminating taxes/public debt. It could be implemented within the existing institutional structure, with a single legislative Act. (if curious: "Permanent 'Quantitative Easing'" also here in Medium but not behind the paywall)

The income could be expanded to include everyone employed in any business or government (continuing with differing benefits for different positions, at least initially), which would maximize sustainability. At no time in any of this would there be any limit on how much money a person could make as a 'singularly self-employed person' (neither the employer nor the employee of any other person). (if curious: "To Preserve What We Have, What We Have Must Be Enough" also...)