Unconstitutional because generating illegal votes violates the equal protection clause of the 14th amendment. It's the same clause used during desegregation and for imposing judicial oversight of redistricting by states.
If the new Congress has a quorum and there are disputed slates of electors, they decide which ones are legitimate. If that results in no candidate receiving a majority, then it;s thrown to the House for President with Pence presiding and 1 vote per state delegation. VP is done by the Senate and presided over by the Speaker pro tem of the Senate.
The envelopes were supposed to be kept as well as the votes. The connection is severed, but the envelopes provide an audit trail for the casting of illegal votes if they include people who will swear they never received their ballot. It also makes the fraudsters come up with envelopes to match their ballot counts including the pristine unfolded ballots with perfectly filled in circles.
That finger sticking into Lake Superior includes Michigan Tech.