Operating within current CCG rules, you can also do a pod system (3 permanent + 5/10 others), as long as permanent rivals are kept within pods of 4, 6, or 8. I think a 6+8 system fits the ACC best.

A pod system opens up the possibility that some years will feature unbalanced divisions, but ADs likely value the balanced schedule more than competitive balance and even a "weak" division in a 14-team ACC should still feature a champ with a 6-2 conference record.

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Here is the 6 team pod
Atl/Coa
VT/UVA
Wake/Duke
NCSt/UNC

Here is the 8 team pod (this could be parsed any number of ways with essentially the same result)
B: FSU+Lou & BC+Syr
D: Mia+Pitt & Clem+GT
A team's 3 permanent riavls are their paired team and 1 team from each pair in the opposite B/D list. For example, FSU: Lou+Mia+Clem and Syr: BC+Pitt+Clem. Each pair in the B and in the D list are assigned to opposite divisions each year with B-pairs switching divisions every even year and D-pairs switching every odd year.

Nerdlinger, can your list of rivals in a divisionless setup be contained in sets of 6 and 8? Not all 14 teams are listed in your reposts.