Quite frankly you don't have to make a move. By all means get a lawyer to protect yourself, but also realize you have more ammunition in your favor to have things go your way.
If your wife keeps asking for dates, let her. You have a busy life with work and maintaining a relationship with your daughters and the things you do for yourself, so if your wife wants to file, let her do all the leg work. YOU did your best to work on the marriage and YOU did the work emotionally and mutually, so if she wants to dissolve it, then let her.
So what if her L files, then so be it. You and your L have the capability to drag it out so that in the long run, in many ways you'll both get what you want. I'm not saying live in a fantasy land where the notion of divorce doesn't exist, but understand that though you may feel powerless, the tools to getting through all this are right under your nose.
