The cost of remdesivir is approximately $364.oo per dose, and several doses are required,(IIRC 6 doses) according to NIH.
If this stuff is so "dirt cheap", I imagine BigPHARMA will oppose any 'off label' human use.
I just got off the phone with my buddy who has a cattle ranch. He said he has a good supply. I told him if I get sick I was coming to see him.