It's a pity AKG stopped making the legendary K-1000. It had the optional binaural-processor with digital inputs when it first hit the market, but this was quite some years ago.
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http://www.akg.com/products/powerslave,mynodeid,15,id,249,pid,249,_language,EN.html-> http://www.akg.com/products/powerslave,mynodeid,15,id,768,pid,768,_language,EN.html
They are in the class of the Staxx "Earspeakers", just cheaper. Maybe you find them on eBay or a similar second-hand site.
I own both items since over 15 years and still have to hear better and more detailed reproduction of an audio-source.