Give the excellent RE teams out there like DemonHades and others time to work on dumping the sticks and seeing what we can do with them, and I can almost guarantee we'll see a post in a week or two on how to convert a standard Kingston or Sandisk USB drive into a JIG.
I'd have to say that either the clones are fake and just a way to make a quick buck, or that they are real and are just using a modified off-the-shelf method to mass produce them so quickly. Creating new hardware takes time, a lot more time than these clones are allowing for. Taking an existing piece of hardware and repurposing it would be cheaper and faster. And if they can do it, then I say, why can't we?