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Losing an EQ band is not an option.

And yes,cascading two butterworth filters of the same order and frequency results in a filter with 6dB point as edge. This is how Linkwitz-Riley filters are constructed.

But maybe the shelving EQ bands could be done with selectable slopes (at least 6dB in addition to the 12dB standard?) and the locut/highpass EQ could be with selectable Q?