You could see if you could get a direct replacement off Reverb - at least it's plug-and-play.
The vast amount of spaghetti is because of the buffers - they prevent the pickups interacting with the volume and blend controls. The average preamp has the pickups going into the blend and volume controls, then to the preamp, tone controls wired to that, then out to the jack. These Barts with onboard buffers have the pickups going into the preamp, then back out to the blend and volume, then back in to the preamp with the tone controls, and finally out to the jack.