The most basic premise of UBI is the universal part. None of the arguments for it function at all, if it is handed out selectively.
The arguments for UBI are that it effectively requires no bureaucracy and can not be gamed, while providing basic needs for all people. If you are doing needs based analysis, you are just back to a regular social system, which requires bureaucracy and will be gamed.
If some government decides to do UBI, than it actually has to do UBI and not just add another layer of social spending on top of an already sprawling social system.
The arguments for UBI are that it effectively requires no bureaucracy and can not be gamed, while providing basic needs for all people. If you are doing needs based analysis, you are just back to a regular social system, which requires bureaucracy and will be gamed.
If some government decides to do UBI, than it actually has to do UBI and not just add another layer of social spending on top of an already sprawling social system.