“Even in the extraordinarily unusual scenario where this could happen under relatively legitimate circumstances, the PA supreme court would overrule it.”
The state Supreme Court would have no say and would get summarily slapped down by SCOTUS. As with the governor, the Constitution gives no role to state courts in awarding the electors.
I want to start by noting that I'm not saying this because I disagree with the way the constitution is laid out, I think that bit is clear. I am disagreeing because the left will only point to the constitution when they think it will help advance their cause.
The dems aren't playing by a rulebook, they're angling for an outcome.
If the election comes down to Pennsylvania in enough turmoil with its vote count that the legislature steps in and awards electors, it won't matter that the USSC will smack down the PA Supreme Court. The effect will be that everyone on the left will have its reason to treat the election as illegitimate and rebel openly.
The only way to get a "good" outcome for conservatism, freedom, the good guys, whatever you want to call it... is for Trump to win in a manner so convincingly that it's outside the boundaries of fraud or obfuscation.
I doubt that will happen, but I'm willing to be wrong. Likely it's going to be fought at every front and from every angle, and whatever feelings people have about Trump, he doesn't shirk away from a fight.