It's not a cost issue. It's supply & capacity issue. You cannot create instant supply immediately, even with a trillion dollars.
Lower requirements by having virus treatment staff with rapid specialized training
It usually takes a doctor between 7-10 years to get licensed. Sure you can change requirements, but do you want someone just out of med school working in ICU without adequate supervision, making complex assessments and treatments? The pipeline for both nurses and doctors is just severely constrained.