bitter - good that first steps have been taken and a plan is underway 
uno - my own experiences mirror yours and i got divorced sorry 
To share a little and let you know I understand your pain, my exh sounds similar. He would have the money to pay a bill, I would remind him in the morning, text him before lunch, he'd get back from work and hadn't paid it 
It cost us £100s well £1000s in the end because he didn't pay his car insurance and ended up in court.
We had countless talks, they ranged from me saying I would remind him, to screaming rows, to me begging 
, crying, pleading.
I took over all the financial stuff I could but felt like his mum. The bits I couldn't take over he fucked up.
The one day I had to find £7k in 7 days or bailiffs were coming round. He'd been hiding the letters.
He was depressed but wouldn't take tablets, said he'd see a counsellor then changed his mind.
I couldn't sleep with him, I had no respect for his constant lying, crappy, little boy ways.
We split. He's still the same way now with money.
So, sorry, not really positive, but I wanted to say I understand your utter frustration when its only him that can change things and he says he wants to then doesn't do it