The SGTL5000 datasheet only shows registers for five 20 bit coefficients for each of the 7 different bands- no separate values for L and R channels. So, I would say no, this isn't possible using the SGTL5000 internal DSP.
You might be able to do something like this using the Audio designers filter elements, but 7 bands X 2 channels would be a lot of processor load on the Teensy.