not ideal, but if you are careful, you can get a pretty solid stereo sound using a blend of the two mics and a bit of eq. put the piano lid on the long stick, and position the c1000 just above c6 about 10" above the soundboard up near the hammers, pointing slightly off axis (about toward the players feet or knees). position the sm57 just below c4 in a mirror type orientation to the c1000 (also pointing at about the players knees or so) - maybe give the 57 about +3dB high end boost to get some edge on the bass notes. you can also bump the bottom end on the c1000 a couple of dB if you want the higher notes to be rounder. listen carefully for pedal noises and other mechanical sounds.