Well, there is one way Jeep could make it work. Our glimmer of hope comes to us from several years ago in the form of the Mopar JK-8 kit. Chrysler's official accessory part company actually created a kit that would let you convert a JK Wrangler Unlimited into a truck. It used fiberglass panels including bedsides, bed and a new top that could be bolted in either by a dealer or by the owner.
It was a great idea then, and would be just as good for the J6 because it eliminates the vast majority of the expensive development and certification, since a conversion kit would just be a set of parts to apply to an already certified model. And since the market is probably a small group of die-hards, a good number would likely be fine with having to put in a bit of work or money to build it. As an added bonus, Jeep wouldn't be taking up space on an assembly line for equipment and cars that aren't likely to sell well.
It sure sounds like a good idea to us. If anyone from Jeep is reading, could you start bugging the Mopar folks to put something together?