I do get that it would never happen, because people would refuse to do it (their belief that it wouldn't work would, in a sublime irony, prevent it from working).
Substitute some other plan of coordinated action for the five weeks if you want. I don't care to argue about it, it's clear from New Zealand and Taiwan and so on that coordinated action works very well, if it is made to happen. It's also reasonably clear that it's cheaper than dealing with a raging pandemic.
It isn't unreasonable to ask for justification of your claim that it'd be so much cheaper to shut down the global economy or take 'severe' action at this time. So, thanks for providing absolutely nothing beyond some vague claims about ideal actions that won't happen?