You don't need to subsidise anything.

> On March 1, 2018, Trump announced his intention to impose a 25% tariff on steel and a 10% tariff on aluminum imports. > Trade Act of 1974 allows the president to impose a 15% tariff for 150 days if there is "an adverse impact on national security from imports

>NAFTA originally required automakers to use 62.5% of North American-made parts in their cars to be imported duty free

You can just require that 25% of PPE purchased by the government has to be made domestically. That would give you 3-4 factories. You make a requirement so they are 1000 miles away from each other and be able to 4x capacity within 2 weeks.