He could simply pass it as an executive order and be done with it. By the way, none of these things you mentioned are comparable to a pandemic in my opinon.Common sense has justified imprisoning everyone of Japanese ancestry, NSA surveilling us all, taking away the right to jury trials
for short sentences, etc.
To give government unconstitutional powers over us is one case
where the slippery slope isn't a fallacy. Once the USSC allows
a violation of the Constitution, stare decisis enshrines it as law.
It can then be expanded upon, eg, Petty Offense Doctrine.