Maya to Unity; Texture/Shadow Baking

This is a scene I modeled in Maya and want to import into Unity. The models and textures import fine as they are, but there are no shadows and I can't afford the version of Unity that has shadows. I'm guessing that baking is the answer to that problem but I have some questions regarding that:

The texture on the mountain is tiled and the temples all share many UVs on the same map. So baking shadows onto the texture wouldn't work, but is there a way to bake out a shadow map so I can keep the tiling and the texture sharing on the models and map the shadows separately when I take everything into Unity? How do I bake out the shadows only in Maya and where do I input the resulting map in Unity?

Unrelated, but any suggestions as to how to handle the cloud bank? Modeling a simple plane with transparency or does Unity have some soft particle clouds that would work well for that?

Thx