Some times we just write checks we know we can't cash! Don't ask.
I'm sorry for your pain Ken, but only you know what will really shift her off the 2nd boat and onto what she values in you. I know you are married, but you have to go back to the "courtship mind set". Explain how the dream and the opportunity coincided much differently than you ever imagined and you reallize not telling her was not right, yada, yada, yada but you are going to do 1, 2 +3 for her and that you Beg her forgiveness.
Lew's rule #4; It is much easier to beg forgiveness than ask permission!
Good Luck, guy! You're going to need it!!!