Another option, maybe a bit simpler is to do what I did with three pickups on my Bass IV kit - a individual stack knob with tone and volume for each pickup, and then on/off sliders for each one.
Completed Builds: #1 TL-1 "Telemaster" (GOTM Oct 2016); #2 The "Maplecaster" scratch build; #3 JB-4 "Bass IV" (co-winner GOTM Jan 2017); #4 ST-1M "Surfcaster" (GOTM Apr 2017), #5 JZA-1 "EC Deluxe"
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