well, the problem is the open pole humbucker and jazz pickups, that are made for the 16mm string spacing on standard basses, and not the 20mm spacing on broadnecks...
in short, pretty much the only pickup options you have on a broadneck bass are the soapbars used on the LX broadneck or the thumb BO BN...
So sure you can get a broadneck streamer with an ash body and a maple top, like the jazzman, but you won't get the jazzman pickup configuration in broadneck...