It is easy to see that the push wouldn’t be about withstanding judicial review... it would be about running out the clock.
Imagine Congress did pass such legislation to designate Trump as an insurrectionist, swing States would immediately remove Trump from their ballots.
Trump would sue but would he get a verdict in his favor BEFORE the election? If a verdict came after November there would be no do over election. They would go with who received the most votes at the time of the election
“...it would be about running out the clock.
No, it would immediately go to the Supreme Court as in the case with Bush and Gore.