UV mapping a image to a plane with geometry

Hi, is there a easy way to solve this :
I want to map a image to a plane with geometry but for the image to go directly onto the plane as if the plane only has 1 face.
If you look at the image below the plane on the left has geometry but I want it to look like the plane on the right ( which only has 1 face ). Hope this makes sense.

Another image showing geometry of image on left. Thanks in advance

Hello, maybe try top view and then Unwrap → Project from view then you should be able to simply adjust mesh to texture in UV Editor