Of course Hot Wheels should sell Wonder Woman's invisible jet as a "real" product. It would likely be made out of clear plastic and would certainly encourage children's imaginative play. Children would understand that the jet is a toy and not really "invisible," but they would certainly pretend that it is.
Hot Wheels should sell Wonder Woman's invisible jet as a real product. They should do so because the consumer is always right, and consumers want to buy this product. Even if it is for a joke, Hot Wheels has nothing to lose - since the product is actually nothing, it will be cheap to produce, and people will definitely purchase it.
Although Hot Wheels may profit from selling "replicas" of Wonder Woman's invisible jet, marketing the invisible as a real product would damage the integrity of All-Star Comics. The invisible jet could possibly be sold as a clear plastic plane, but doing so goes against the very foundation of the concept of an invisible jet.
If it's not a legitimate recreation of what the comic book writers said it was going to be, then the company of Hot Wheels cannot market it as real. You can market it as a recreation of a comic book model of what was in the movies and comic books, but it isn't real.