Looks horrifically difficult thought as does the McPhee concerto for piano with win octet, which is another possibility.
Still trying to cope with the idea that i love something written in the last 60 years.Thal
Then I dare you to listen to Emil Tabakov's Piano Concerto (première 2003!)
Also, here is one that most people probably forget: Bartók Piano Concerto No. 1, but only the first movement. This is the one movement of the piece that has no strings, so I'm sure you could use this one if you wanted to.
I believe that's actually the 2nd concerto you're thinking of, one of my all time favorite concerti (actually all of Bartok's are in my favorite favorites.).