try talking to David at Audere, maybe you can get a volume/mid, then treble/bass. Im sure it CAN be done, but maybe I am wrong. think you are hosed with the active passive push pull
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You could try John East too, he's normally up for a challenge. http://www.east-uk.com/ His stuff has push/pull stacked pots.
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'63 Precision, Sandberg PM4, EBMM SUB Fretless, SBMM Ray34, Markbass LMII Head Schroeder 1212L. P-Bass Club #447, Markbass Club #131, Schroeder Club #61, Sandberg Club #58