Don't start off with a $12,000/year UBI, eliminate SNAP and instead give everyone a tax credit in the same amount. Adjust the tax brackets to make the math work out. Then do the same thing with housing subsidies, and Medicaid, until all the largest programs are gone. At which point you can see the results and start asking why we shouldn't just do everything that's still left at once.
Don't start off with a $12,000/year UBI, eliminate SNAP and instead give everyone a tax credit in the same amount. Adjust the tax brackets to make the math work out. Then do the same thing with housing subsidies, and Medicaid, until all the largest programs are gone. At which point you can see the results and start asking why we shouldn't just do everything that's still left at once.