Well... I don't see why Ash wouldn't fit in. At least it would be a little more active, as well as his other half/alternate persona. Therefore, it would actually be kind of a four way battle between them. But, truth be told; Kane Hodder should definately get the Jason role. He loved that role, even so much as to get a 'Kill' tattoo on his lower inside lip. Frankly, Ken just wasn't up to the standard of Jason. Kane had already spent 4 previous movies coming up with ways Jason would do things. Even going so far as to tell the director/writers how Jason would or wouldn't kill someone. How can you not have a guy with that much passion for a character... play it? You basically destroyed the character. The outfit sucked ass, his build was way off. Hell, he was too CLEAN! The only good kill scene he had was smashing the guy in bed.
Now, as for Michael Myers. I'm not sure he would work for this. Mainly because Myers was meant to kill his entire family. Which, he is still yet to do; meaning Lori Strode's son from H20. You'd have to make him kin to Jason or Freddy some how. That or just put in some random dumbass and say he's family.
And for the record, Kane's gotta be one bad ass Juggalo. Supportin' the hatchet!