I think I said it.
First, pay GM whatever they want to produce something like 40,000 ventilators within the next 6 months with first thousand or so to be delivered in a couple of weeks. I'm referring to this:
article
Concurrently, find and train staff,
Concurrently find and build ICU capacity.
Do not waive regulations, work to shorten time to meet them.
Do Not flood ICUs with untested and unfamiliar equipment.
I'd throw money at this problem. Overspend but include funds for testing and independent inspectors. I'd also look at more than just GM/Ventec. I'd also find another partnership between a large manufacturer with an established maker of a well known and proven ventilator.