New pickups and passive harness advice needed

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Hi

I just purchased a German Warwick Streamer CV4, and it is the best bass guitar I ever owned when it comes to build quality, materials and playability. Only problem is that the passive MEC pickups and passive 2-tone passive electronics leaves a little to be desired. I must say I am huge fan of fat and burpy jazz bass tones, so looking for some _hum cancelling_ pickups that can help me achieve that goal. I also need a passive harness made, and have an idea:

The Streamer has four pot holes, but I will plug one of them, leaving me with 3 holes.

Would this wiring from Dingwall be feasible, and are there any pickups that would be suited to that kind of thing? I know that series are somewhat louder, is there a way to remedy that or should I not be concerned?

Any help would be more than welcome!