I don't see why the Kings would consider that. McMorris has negative value, and Bledsoe and MkMorris are minimally positive at best. Basically it's Warren or Len plus a bunch of crap for Cousins, and half the teams in the league will beat that offer.
For comparison, when the Suns traded for Barkley, it was Hornacek, Andrew Lang, and Tim Perry. Perry didn't have much value at that point, but Lang had shown more than Len has so far, and Hornacek was much more appealing than Bledsoe is now. Barkley was a more proven commodity than Cousins, but not by much; it's pretty obvious that Cousins is a superstar if he can get his mind under control.