I'm a fan of CafePress, and I'm happy to set it up unless anyone has objections. Let's just do it. If anyone would like to set up alternatives to CafePress, feel free to - there's nothing stopping us from having them side-by-side.
Blanko, could you send me high-res copies of these and/or the PSD? I'm assuming that, since this is a derivative work of a CC BY-SA 4.0-licensed work, these are also licensed under CC BY-SA 4.0, but if possible, could you please state this explicitly just so we have all bases covered?
Once I've received those, I'll set up a store at no profit. If no profit is not a possibility, I'll come back here and discuss options.