Interesting perspective on the issue, although there are some challenges.

The greatest asset of a UBI is it's lack of complexity... to guarantee work to people who need it becomes costly to administrate... how do you figure out what needs to be done? What benefits do you provide, if any? How to arrange wages to provide some security at a modest public cost that is correlated to the value of the work being done?  How is this conducted without some of the work provided amounting to an interference in the private economy? The answer to all these questions amounts to bureaucracy and an unwieldy, unevenly distributed system.

UBI does not preclude people from working, in fact it provides many preconditions for meaningful, gainful employment - enabling people to afford daycare, transportation, education, etc., all while giving leverage that boosts the working conditions of jobs available (people who are utterly dependent on their job can't refuse unsafe work, negotiate higher salary, etc.)