Just testing the waters out here to see what kind of interest exists for this Jabba's Palace creature. Unfortunately, this guy is in a unique category with all sorts of factors working against him ever getting made into an action figure:
1. we don't know if he is actually a single alien, after all. Decipher and many other EU sources seem to think so, but no one has ever given thought to the idea that it is actually two separate aliens (possibly with snake-like bodies). I prefer the 'two snakes' idea myself, since it means that Hasbro could make these guys with bendy bodies and pack them together. Getting two figures for the price of one helps to offset the "who the hell are these guys?" problem.
2. if it is just one two-headed alien, then no body has ever been designed for it by ILM. This is one of the reasons I think Hem Dazon has never been made, Hasbro doesn't seem to appreciate being forced to design stuff on their own. With Adiss' complete obscurity and large design, Hasbro isn't going to want to go through all the extra work of designing a proper body for the alien. Although this is another argument in favor of using the 'two snakes' idea, no bodies need to be designed.
3. the most detrimental factor against Cane Adiss ever seeing action figure form: He never made it into any Star Wars film. The only reason we know he exists is because of all the behind the scenes photos and documentaries from ROTJ. In fact, Cane Adiss only shows up on film in the "From Star Wars to Jedi" documentary.
So he could easily go in the "discarded ideas" pile and never be thought of again (although, the upcoming Sketchtrooper shows us that discarded ideas are still possibilities for action figures), or Hasbro could make him and put the same level of effort into him as they did for Ephant Mon. A well made figure sells itself, regardless of how much screentime it does or doesn't have.
And personally, I would rather have one Cane Adiss than a hundred Sketchtroopers.