My answer is no different than it was when you first posted. Six months notice is outrageously unreasonable. Before I'd even consider any contract that required me to give six months notice, you'd have to guarantee me a bonus so large that it would pay all my living expenses for that six months all on its own and it would have to locked in so tightly that you couldn't wiggle out of paying it no matter what I did. What's he supposed to do, tell a new employer he can't start for six months? What new employer is going to wait that long? He's a free agent; you don't own him.
Talk to an attorney in Hawaii but if I were your foreman, I wouldn't be at all interested in continuing to work for someone with such unreasonable expectations.

