This is why shutting down the right to strike is a short term approach: you can't make people choose to start or keep working in your sweatshop, so eventually you run out of staff.
If you're a government, you can; it's called a draft. The US seems to be preparing for it.
Some are clear rejects, some are good for getting up early and walking perimeters, others would suit the motor pool. An occasional few will gel for traffic control, signal intell, etc.
The trick then, for a state, is to incentivize with carrots, sticks, patriotic abstractions like duty, etc. the ones they want for the jobs they have.
Now its time for levelling up training.
Doctors need to pass a lot of exams.
We know from the PATCO strike there is a pool of spare ATCs, including "military controllers, and retired personnel who temporarily returned to service". https://en.wikipedia.org/wiki/1981_Professional_Air_Traffic_...
Thus, retired civilian personnel is a possible draft pool for a skilled job like ATC which require passing a lot of exams.
That pool is small, certainly, but it was enough to break PATCO.