^^Really like that idea
The only thing is, the AFL wouldn't be able to make that call unless they were positive both clubs would miss the finals. If one club was, say 10th with 5 rounds to go, then there is a chance they could make the finals.
But if both Essendon and Carlton were 16th and 17th, then I reckon it would be a go-er. Make the standalone game a real family-friendly affair.
The only other game this might apply to is St.Kilda vs Brisbane at Etihad, but Essendon vs Carlton would be ideal.