Hi Christian,
Are you thinking about a community-based company? What came to mind was the Block Parent campaign that was popular in the 70s and 80s, which I heard has recently gained interest in re-establishing. It’s not just about putting a sign outside or a sticker in the window, but more so about how to build the clientele. Just a quick thought I had. It might not work for you, but perhaps there is something in their model that would peak your interest.
Louise