You could take your eye out with those
Unnecessary complication. Most people have some form of T-cell immunity, which is why the incidence of significant symptoms is low. There are effective existing therapeutics on the shelves of every pharmacy in the nation. The plasma ruse is only about cashing in, or optics, or both. Questionable whether most recovered patients will even possess blood borne antibodies.
The Trump team will contest all the D results in response. No one new will get in and those whose elections are contested will similarly be ruled out. Then it will become the mother of all Constitutional battles.
Of course, if POTUS drops a political neutron bomb before 11/3, we might see this play out very differently.