Citizen Service is still awful even after the 2.2 changes. For it to be something that I would take (and I sooooo want to for that starship trooper feel) soldiers need to give 3 unity per job, making the unity output equal to cultural workers. This would make soldier spam viable. And effectively exchange cultural sites for fortresses for citizen service empires. Cultural sites would still be used situationally by citizen service empires if social research need boosted rather than fleet cap boosted.
You're asking for too much. Even Police State, which gives +1 Unity to enforcers, puts enforcers on par with entertainers but still not as good as culture workers. You want a job that provides more unity than entertainers, as much as culture workers, doesn't require consumer goods, in a building that's not planet-unique? Keep in mind the society research culture workers get is a pittance; they're much less efficient than science workers. They're main contribution is the unity, and your vision of soldiers would equal the main purpose of culture workers in addition to the main contributions of soldiers?
Soldier spam, or at least a moderated amount, is still useful imho. Their fleet capacity is very valuable now that raw population gives neither fleet capacity nor starbase capacity. The stronghold comes with its own housing, making them useful to plant in a smaller, resource-gathering world where housing and jobs are somewhat equal, there's no housing to support specialist jobs, and you want to save your districts for resources. Plus their full potential can be quickly accessed, requiring only one pop while other buildings need two plus consumer goods. Good for newer colonies.
My current game is not even Militarist and I have a good 5 or so strongholds, when most of my worlds have less than four building slots.
civics that add pop jobs to your capital
You do realize that none of these actually add jobs, do you? They replace an administrator job with a different kind of ruler job. A science director, for example, provides a good hunk of research and some amenities. An administrator provides a good hunk of unity and more amenities than the science director. There is a trade-off involved.
Just making sure you knew... If not, sorry to burst your bubble.