Needing a legacy shader mixed with vertex color

Hi,

I'm looking for a way to blend two shaders but I don't know if it's possible. I'm unable to find any documentation to proceed on my own for what may seem a rudimentary task. The objective, eventually, would be to mix a shader that does diffuse, specular and self-illumination, with one that does vertex color that uses the data stored within a 3D model made in Blender. It would run on mobile if all goes well. I first tried the simple shader for vertex color here: http://answers.unity3d.com/questions/950886/question-about-blender-and-unity.html It works in Unity so that's good. Now, the legacy shader I'd like to blend it with is Illumin-Glossy.shader, found at Legacy Shaders/Self-Illumin/Specular within Unity.

So first of all, is blending both a doable task? If yes, what should be typed in the final shader exactly to get a decent performance on mobile?

Many thanks! :)