All the legal advice I've heard (second hand) here in the forum is to NOT to make any changes to your finances. Keep everything status quo. Legally everything belongs to both of you, so moving money around has no real effect and only makes you look bad.
Re: marriage counseling. Sorry to repeat, but I really think you should emphasize HIM getting himself to a healthy place. You can do all the marriage counseling you want but if one partner is not well, I think it's not only a waste of time and money but could actually backfire. All the pressure to get the marriage right can jeopardize that one person's mental health.
Easy to give advice, I know... At least this is the same thing I'm telling myself. My W has to be in a good place for herself, for her to even be able to think reasonably about our marriage.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final