In some ways, enforcing child support makes reconciliation more likely not less. He may freely walk away from you. He can't easily walk away from his responsibility towards the children. Most LBS make divorce easier for the WAS by sheltering them from natural consequences instead of letting them experience them. It's also, of course, an act of putting yourself and your children first since he's fired you as a partner.
"Friendly reminder--the court says you owe me $1,000 this month towards the kids", "Reminder #2 - the court says you owe me $1,000 this month towards the kids and I have not received a check.", then set a hearing to directly dock his wages for non-compliance. Note, no part of this involves criticizing him, guilting him, negotiating, punishing, pleading, trying to solve his money problems for him, etc.
