I'm going to play devil's advocate here:
The OCers would have to be loud about it, or cause a scene, because if you are trying to make it look like coincidence, how else would the people who are CCing going to know what's going on? And how would the workers/owners know that the reason the CCers who just happened to be there randomly are leaving because of that? Would they all go from CC to OC?
And don't we want to be honest? This almost feels like you are lying to someone and trying to mislead them. Or like we'd be trying to bully them into changing. And a bunch of CCers allchanging over to OCat once could induce panic and look threatening? I don't agree with the banning of guns from establishments, but that is their right.
Overall, good effort, but I would not participate in something like this. I prefer to politely tell them why I will not be patronizing their business, pass the word on to other gun owners around, and let them go individually and also explain why they cannot patronize a business that isa CPZ. (criminal protection zone) If I'm wrong, let me know why; this is just my first impression of this.