If the short-term problem is specific to Covid, you just need to bring/train people for that.
Training people to assist Covid cases, run PCR tests, should be a matter of weeks, not years. Germany did it, I have 4 (four!) test centers on within a block of distance, all of them are filled with students and otherwise-unemployed people who got some minimal training.
I don't think test centres are the problem. I live and the UK and the only time tests were scarce was a few days around Christmas when there was very high demand.
Training people to assist Covid cases, run PCR tests, should be a matter of weeks, not years. Germany did it, I have 4 (four!) test centers on within a block of distance, all of them are filled with students and otherwise-unemployed people who got some minimal training.