FM Call Channel = Channel 33
FM Talk = Channel 34
FM Talk = Channel 35
There you go. It nests up against the gentleman's agreement on Channels 36-40 being for SSB. You're away from Channel 9 and 19 (as if Channel 9 mattered anymore) and you're away from the majority of AM rag chewing you'll still find on a local level. It's not perfect but it's a start. You can add or move things as necessary if FM CB gains any real popularity.
Yes, I just made this up, but it's as good as anything you'll find. Feel free to run with it. I haven't trademarked it yet.
Waiting on the Sad Hams and naysayers in ... 3 ... 2 ... 1.