Not sure I'm getting this. Would it still be playable as a normal L2000? Or would the pickups work strictly in single coil with the only option being which coil was in use? (Plus series/parallel and active/passive?)
Exactly as described and not a jot more. No humbuckers, no active.
A Jazz bass: two single coil pickups controlled by VVT knobs.
The three switches offered three little bonuses: the first "moves" the neck pickup a towards the bridge; the second "moves" the bridge pickup towards the neck; the third puts them in series.
Find a standard sound for you (eg mine would be neck outer at 8, bridge inner at 5, tone somewhere around there) and then you've a handful of little tweaks available.
(And the body is a sensible shape and the nut isn't 1½" and there's no pg
)