Why not go to non-permanent divisions. Everybody gets 3 permanent opponents you play every year and 10 teams you play twice in 4 years. But the divisions themselves will be different every year.

Ok, in reality you probably would have to set up a rotating division system that rotates between 4 different divisions every 4 years and makes sure you play every team at least twice every 4 years.

This could create the same feel of just getting rid of divisions but allows the ACC to keep the CCG within existing NCAA rules.