There is no negotiating in this. Any deal you try to strike with me to make me miserable in exchange for the money? It would fall through. In order for me to accept your offer, you'd need to give the money over immediately so that Boyd isn't killed. After that, I'd have no reason at all to follow through on my end.
Plus, there's the fact that I don't trust you for a second. I don't believe for a moment you would have given Boyd back the money at the end of six months, even if she had made it through without killing herself or going insane.