My version of the kimura from Rap Star or Overhook Guard is derived from the omoplata attack from the arm-warp in Kid Peligro and Rodrigo Medeiros' book, The Essential Guard.
They don't show a kimura from this position. But given the way they attack with the omoplata, I assumed that the kimura would similarly attack the inside/wrapped arm.
Here's a version of the kimura from Rap Star or Overhook Guard that attacks the far arm instead. What is especially nice about this kimura is the way shooting the far side leg helps create an excruciating angle for the shoulder lock.
Cleber Luciano with Sherdog's Technique of the Week: Kimura from Guard