I went through this in the past and my options auto updated and exercising them was not a problem (1/x) price per share for (n*x) options. IANAL but I don't be

I went through this in the past and my options auto updated and exercising them was not a problem (1/x) price per share for (n*x) options. IANAL but I don't believe the company could legally split stock without your options being affected, because they're materially changing the promise of what you are owed. Also your options have real impact even before you exercise them, because you can do things like pay the taxes early. If you did this and the value materially changed, it wouldn't line up.