I guess telling her that you believe this is a mistake, you love her, you want to protect the kids from the hurt of a divorce and willing to do whatever it takes to make it work. I am talking the day before or day of final papers getting signed.. I guess if we are at that point I know what the answer would be.
i assume you've said all this before. I don't see any benefit of saying it again at the last second.
But, why do you think the day you get divorced is a critical day? It doesn't matter much in your long term R with your W.