Well, after hours of tries my brilliant mind formed an idea, to render both models separately but use non-textured version of another mode in a scene to make a proper shades and light stuff.
That's will double the time and will eat even more of this by applying and deleting textures, but I hope that in the end it's will work fine and I will be able to make some scenes.
For now I plan to make one line this WIP image, hope you will like it.