You don't have to do any of that other than change the zoning/permitting/building process (which you would need to do for your plan above as well otherwise you won't be building much of anything). The problem in San fran isn't lack of builders or even lack of labor to build. The problem in san fran is the government forcing the process to permit and build something to multi year approaching decade timelines (if it is even approved).
Basically all they have to do is set some basic, reasonable rules (heights, setbacks, etc) that, if you stay within them, you get your permit in a month or two the problem would be 70% solved within a decade. They might have to rezone some of san fran to allow denser building construction (with the same fast tracked permit described above) to get to 100% but that is literally it. They aren't doing it because the nimbys like the system the way it is (and the increased house value windfall it has given them).
Basically all they have to do is set some basic, reasonable rules (heights, setbacks, etc) that, if you stay within them, you get your permit in a month or two the problem would be 70% solved within a decade. They might have to rezone some of san fran to allow denser building construction (with the same fast tracked permit described above) to get to 100% but that is literally it. They aren't doing it because the nimbys like the system the way it is (and the increased house value windfall it has given them).