Mica I'm sure in the UK talking about the producers knob would produce a chorus of laughter in the studio and some bemused smiles.

Talk about two countries divided by a common language eh?
I know it as the D.F.A. knob, D.F.A. being an acronym of the answer to the question 'What does it do'.
But anyway, back to the question at hand. Is having a separate filter + q switch per pickup impossible? Is that what the signature electronics harness is? Drilling more holes is not a problem so long as the current holes are filled with something useful.
Could I just buy an extra preamp+filter per bass and have one running off each pickup to separate outputs? Would I be able to sum the outputs at some point like I have with cable I use with the Series 1?
Whatever the solution, I would like to put it on both basses so that they do match up and sound the same. (That was the original objective behind securing the MVP)
Is there any chance you might be able to email me the price of the solutions that are feasible?