I have in conjunction with John East and Aaron Armstrong been developing a multi coil pickup with two coils per string. This is connected to the preamp via an electronic mixing board. They have been designed to work in conjunction with the new 03 dual filter preamp. However it is not an attempt to copy the Wal pickup it will be in the ballpark but we did not reverse engineer a pickup and to be honest nor would I even if I could. As you would expect these pickups are not cheap with a lot of work involved in building them but having spent some time with the prototypes they are worth the effort.