Maybe I'm being a little thick here, but weren't you interviewing for these positions regardless of your divorce decision? If you weren't divorced, wouldn't your kids and wife follow you anyway?
A good friend of mine ended her marriage while they were in the process of adopting her ex-husband's niece. His sibling also faced a serious drug problem, but they waited for the adoption to come through before they finalized the divorce agreement (they were separated in the interim). They just had to get that niece out of that home.
Look, maybe I've accidentally smoked some of my sister's stuff and maybe I've spent too much time in unicorn land, but I think, with some careful strategy, you could have your kids join you. You definitely need a good lawyer to help you think this through, even if that lawyer says that the advice I'm giving you is plain fricking stupid.