Please don't disregard this idea lightly.
Copper, and Copper based nano particles (specifically Copper Iodide (CuI)) have shown significant post exposure viral inactivating properties (both intra and extracellular). Administering CuI nano particles through a vape or inhaler format, would minimize absorption in the body while maximizing exposure to the viral particles (in both the upper and lower respiratory tract). All though heavy metals and their bonds are considered toxic when exposed to the body, people have been breathing these things in for years with less health risks that dying from corona virus. The point being this could be a drastic but successful measure for severe patients.
The nano particles would have to be manufactured so that the body could get rid of the excess amounts. Unlike colloidal silver, the nano particles would have to be extremely small and consistently sized so they could pass through the body. Also it would be greatly beneficial if the solution in which the particles were suspended (before they were breathed in) could contain an anti-inflammatory and other immune supporting ingredients.
Please let me know if this is crazy talk, but please share if there is a chance this could be tested.