Impeachment needs to be done methodically for these national security reasons.
But if Trump can’t be convicted, the Democrats and the few Republicans they can peel away should switch gears and do a censure of Trump with some real legislation in it: they should attach very targeted legislation to a censure that would severely curb presidential power; as well as leave section 3 of the 14th Amendment to prevent him from running for office again as an open option if Trump starts to stir up trouble. An impeachment conviction may not be necessary, as this strategy would solve the problem.
I explain all of this more fully in The War After the Election [https://medium.com/illumination-curated/the-war-after-the-election-545de96aa4ca?source=friends_link&sk=627c55d616d9296af3e398f1686493a4] and in a link at the end of it that explains the legislation. The article also summarizes the findings of the Transition Integrity Project, a group that included former Congressmen, United States Senators, previous cabinet members, White House Chiefs of Staffs, Secretaries of Defense and Homeland Security and state governors whose “war games” in June of 2020 predicted almost exactly what happened leading up to the Capitol attack.