How do I create a telescope/spyglass view in VR?

I need to change the default VR view to a zoomed in, heavily vignetted, monoscopic view when the user holds the controller (modelled as a spyglass) up to their HMD, but for the life of me I can NOT figure out how to:
- Change the field of view to be more zoomed in
- Get the view to be non-stereoscopic (I want the same view sent to both eyes)

Can anyone offer any advice on this?

 

You can try with a second camera that renders to a render texture, and use that texture on the "lens" of the spyglass