To my exceptionally limited understanding - and I would love to be corrected if I'm wrong - operating a ventilator correctly is not a matter of standing in front of a machine and watching a few numbers for problematic readings. That can be done by machines and computers. What requires training is everything else around it, which requires an understanding of medical protocols, anatomy, the ability to respond usefully to emergencies without being in the way, and so on.
Which is to say that this is not something that highly specialized and narrow technicians can be usefully trained for in a very short time at this particular moment.
That's not to say your idea is bad! It's definitely good and worth exploring in the future. There will be time to explore how to have smarter tools that can be used with a less general skillset can be developed. There will also be time to explore how to develop specialized and narrow curricula for such things - itself not a trivial task.