Declare the last election null and void

[onenote]

39. What is theoretically possible and what is within the "realm of conception" are different things

It is theoretically possible the Democrats in Congress will all band together to vote for the repeal of Social Security. It is not remotely within the realm of conception that they would do so.

So too with the "extremely extremely unlikely" scenario you postulate. Let's imagine that there was evidence that Trump, Pence, Ryan and Hatch were somehow complicit in something unlawful relating to the election. There are a number of conceivable scenarios as to how that might play out -- scenarios that are far more conceivable than the one you suggest and that push your concept to the outer boundaries of the realm of conception or beyond.

Put another way, removing Ryan and Hatch from their positions in the line of succession, and replacing them, requires only a majority vote (removing them from Congress requires a 2/3 vote). Why wouldn't the republicans simply vote for a replacement from their own ranks, who would then succeed to the presidency upon the resignation of Trump and Pence? What leverage do the Democrats have to force a convoluted game of musical chairs to install Clinton (or any other Democrat for that matter) in the White House? The threat of impeachment? As noted, that could be avoided by Trump and Pence resigning, which is part of your proposal. The threat of prosecution? The new president could and would pardon them and the Democrats would be unable to stop it. If the situation is so bad that even Republicans feel that Trump and Pence and Ryan and Hatch have to go, they wouldn't participate in a charade that let's them avoid prosecution -- they'd let the new president, presumably there as a caretaker until Cruz/Rubio/blah blah blah runs in 2020.

So, yes, magical thinking.