You're right. Under New Jersey law, candidates may not be replaced on the ballot with less than 51 days before the election. It's 55 days now. So the deadline expires this Sunday.
Menendez will not be replaced before Sunday, but I'll betcha he's not on the ballot in November.
The New Jersey Supreme Court is corrupt. With that as a given, there is no certainty that they'll allow the switcheroo another time under similar circumstances.
The Kean family has enormous influence, whereas Forrester had none.
That means if the RATS try their antics, they may get their way -- OR they might end up with no one on the ballot, which would be just desserts. They had best tread very carefully.