There might be some legal or tactical benefit from that 6mo suggestion that is legit so I won't comment on that angle of it.
I did not really have a 'plan' (and that showed- ha!) but from an emotional stand point the 6mo suggestion has a lot of downfalls IMO. What if at the end of the 6mos she has, on paper, met many of your demands and yet you still feel like you want a divorce? As someone else mentioned, sometimes there is just to much water under that bridge. At other times we just 'know' when someone is manipulating us and the situation by 'meeting our demands on paper' and yet things remain very toxic, unbearable, unstable.
It is a lot to think about and the laws in your state will make a difference. Some states are easier to get divorced in than others.