I love the idea of having a bundle of necks and a bundle of bodies and being able to switch them to work out what sounds good together.
Glad you're getting on with the Sims pickups too, I looked at them, and even made a bitsa with similar functionality and got lost in option paralysis - between that and the 8 knobs on the ACG equipped streamer I had there was a definite digression to enjoying the simplicity of a P bass.