I base this model off of something I do with my business that seems to work for me pretty well. I give each employee points for how long they have been with the company and how good of a worker they have been. Then I give them things they can redeem those points for and let them choose. I end up spending the same amount of money either way, but I am not wasting it by giving the people something they don't value.
There is also the issue that nobody can really make sure the sums are adding up to what the government says it does, so whatever the government needs to pay for things like abortion, it could just say it got. The whole thing is about illusion of control, which will pacify people.