Because the style is quite modern eclectic, my thought was that a muted cow hide rug could work If you feel a bit more daring - these muted colours would echo the traditional carpet or failing that go for a high sheen textural rug that doesn't compete with the monochrome elegance

We have installed wallpaper behind glass splash backs on many occasions without any problems, the glass usually being attached by a thin beading of clear silicon applied around the inside perimeter of he glass, then fitted the day after the wallpaper install. MOST importantly the INSIDE of the glass be kept perfectly clean on install as even fingerprints will stand out

Either stick the image to the wall and add a glass splashback OR get the image printed on the glass and mount that. Don't forget to come back and post a picture.

I'd search Designers Guild. Or Porters Paints. But others will be along with ideas.