We talked through doing this for the Emerald Bay and even went so far as to start a GB interest thread and chat with Matsui. I had the art also approved for re-use. There really just wasn't quite enough demand for it to make sense. The larger orders really spread the shipping costs around which are the real killer for things like that. For instance an extra thousand chips is marginally more expensive to ship, but really drives the price per chip down.
It might be easier as we wouldn't have to deal with all of the combinations of different Emerald Bay chips color combinations that were made, but the Zen stuff was so long ago I'd have no idea who owned the art.