Yeah, its a bit peculiar what you're asking. 0.08 Q = 7 octaves; the FBQ has bandwidth settings up to 10 octaves, but from what I can see modeling its filters in REW, it's not accurate above about 2-octaves. The 10-octave setting is more accurately a 5-octave filter.
That said, there has to be a fundamental miscalculation or misunderstanding somewhere on your part. Keep in mind that the entire audio spectrum from 20Hz-20 kHz is 10 octaves. Also, a so-designated 7-octave filter will affect that much both above and below the center frequency. As such, a 7-octave filter will effectively wipe out the entire audio spectrum. Somehow I doubt this is what you really want/need to accomplish...