I haven't been to the Metro in a while. Is there any sort of lip to which one could attach a clamp + gooseneck extension?
Or maybe a Gorillapod would do the trick? Adjustable base, two sizes - one small, one large. If you're willing to swing up to my place, or if we can find a convenient location to meet, I have all of the above available for loan (Superclamp, flexible gooseneck, small & large Gorillapod).