It is my opinion, that this is not necessarily a lack of product just for a trial. I believe that government may be involved; requiring and securing the entire production process is the US with oversight for mass production. What will take a bit of time is mass-producing IV B for a market larger than just the trial.
Step one, figure out the dose.
Step two, build a secure, US only production infrastructure
Step three, start mass producing and stockpile several hundred thousand doses (with grant money)
Step four, announce a breakthrough drug
Step five authorize Emergency Use and run a controlled trial simultaneously.
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