I've thought a lot about this since you wrote it. I do wonder if this could become a pyramid activity.

One problem is that it has to be people who are relatively comfortable talking to strangers, which by definition excludes the main people I'm trying to reach.

That said, I wonder if there's a middle ground. Maybe people like myself, who feel unfulfilled, but don't have too much difficulty talking to strangers, could be the ones who hold the signs. And we could help those people get to the point we're at... it could work.