Is it possible the toon material and specular from the blender internal render engine to be rendered in the cycles render engine by using render layers?
Blender internal and cycles are completely separate rendering engines, only the object surface data can be shared between them. Each render engine uses incompatible material data.
To combine the two render engines you can render an image from each engine and composite the two results together. You can either do this manually by saving one or both of the results to file and inputting the files in the compositor or 2d graphics application. Or you can have two scenes, one using blender internal and one using cycles that can both be input into the compositor.
BlenderCookie has a tutorial explaining this in more detail.