Our club has always scheduled our monthly styles competition/judging classes to coordinate with the Club-Only Competition calendar. We meet once a month (apart from the general meeting), review the style at hand, present commercial examples if available, and judge homebrew entries, sometimes with bjcp scoresheets, other times without (depending on the number of entries). The winning entry gets shipped for free to the COC. Of course we will continue to hold our monthly judging/style classes, but it would be nice to continue the COC, even without the AHA.
I'm not sure how it would work with established one-style competitions since they may have to limit the number of entries from any club to just one, but I certainly think we could start a new competition circuit to replace the AHA COC. I am sure we could post the schedule in Zymurgy. All we need is for 6 to 10 clubs per year to volunteer to host a style.