And to the extent we can rely on info from the US administration, Dr. Fauci commented (with some hedging) that Fall may bring widespread testing of the population at large for antibodies, which could be co-opted for this purpose as well.

I hope your proposal, and others proposing similar steps, win through. We need massively parallel efforts pursued. Not just to solve this current crisis, but to improve our overall global ability to rapidly reply to the next such problem. Best of luck to you.