It is an open chamber, they will make this vote a living hell, possibly trash the building, and their legislators lives will be at risk, it their 7/4/1776 moment, sadly, I bet they pass on their scared honor.
Don't even get me started how they fubar'd the Obamacare alternative with one Turncoat GOP Senator, BCBS told them either you go along with this or will destroy you politically.
You really want to be sick? Go see former Congressman Mike Rogers Congradutations to Biden and let's get on with pronoucement, what a turncoat...
They have another option, of course.
The state legislature can refuse to endorse _any_ electors by the deadline, and just pass the buck to the US Congress (controlled by Republicans because one state, one vote).
We win that way as well.