It is likely possible to implement such a switch node (adding a note about it, edit: reported to our UX team and it is planned). It also probably could be integrated back if any one would develop that.
You can likely not implement such view modes because all the Lighting/Emissive is mixed in the framebuffer. Or you will have to touch the shaders and it might be a bit messy.
REMINDER: this thread is about Substrate itself (experience, bugs), not about side tech/features support.