As soon as you same I am waiting for a brand name you don't understand how healthcare or medicine works or the points I am trying to make.
I understand that I cannot teach you about this... all I can do is suggest a broader perspective.
You cannot walk out of the bush with a broken leg with just a safe and effective cobbled together ventilator.
You might even be better off spending your money on Alibaba immediately:
https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&SearchText=medical+ventilator
I doubt much, if any of the The Agnelli family's donation has been or will be spent on vents with unknown safety and efficacy (including things as simple as safe materials and QC) from Alibaba.
You can buy a pulse ox for probably $10, and that won't be designed and manufactured under the US CFR. And in a pinch that might be good enough compared to one from Tyco or Massimo that is sold into hospital settings.
But a vent is a different animal.
Much, more complicated... not necessarily in its composition, but often (perhaps usually) more critical in its application.