When you go to court in May, ask for a petition for revision to full custody with supervised visits if he is not going to respect the Soberlink model. When he's substantially stable with that, then you can do a modification down the road. Not sure of the ages of your children but you have to fight like a hellcat sometimes to keep them safe. In my state modifications are like every two years if you file for one, no sooner.
Start in a position of strength and control, then you can ease up as your children get older, your confidence is assuaged by him behaving more responsibly.