Why not nationalize the IP from all the ventilator manufacturers and make a best of breed version. But we would have to get it into mass production in a month to be of significant benefit.
You answered your own question. We've already tried to make our own tests and failed, thereby significantly delaying our response. It's likely that we would fail to integrate the IP successfully on the first try too. Also what is best-in-breed? At this point, for maximum community benefit, it seems like we need cheap and fast to produce, not highest quality.
The problem is ramping up manufacturing and supply chains, not designing a better ventilator. Even if it were, a best-of-breed would be incrementally better at best, but at the cost of months if not years. Efforts are actually going the other direction, a MVP ventalator, because of manufacturing and supply chains.