Changing materials from Toon Shader to aiStandardSurface

[nevoral.david]

I need to export my files to the Fox Render Farm but:

 - neither it didn't allow me to send files with Toon Shaders for rendering;

 - nor it doesn't allow me to export those files with materials switched to StandartSurface/aiStandartSurface.

How can I change a material from Toon Shader to aiStandardSurface?

I have many characters in scenes and don't wanna "recolorize" every single face again.