Often thought about that but I’ve not seen a system that I like that much. If they worked that well it would have become the standard.
Wood and Tronics have a neat system, Variable Pickup Positioning all contained in a covered housing, without the usual holes left when the pick ups have moved position.
THE VARIABLE PICKUPS POSITIONING SYSTEM
Our breakthrough innovation for unprecedented tone flexibility.
It is a fact that most bass players are not aware of the key importance of the bridge pickup’s location on the body. As strong as it might sound, it is not as much about the woods, or the type of pickups as it is indeed the bridge pickup’s position that decides the sonic fundamental of a bass.
The V.P.P. device displaces the bridge pickup in four era-related spots: 1960s (Vintage) J-style, 1970s J-style, MusicMan, Alembic-style.