I've changed a few of the Dingwall pickups to series to move towards the P tone sound. You take two of the four lead wires from the neck pup and solder them together, a bit of shrink wrap and you are done. Ten minutes tops. I don't recall exactly which colors at the moment, and that may have changed with pickups, but a quick line to Dingwall tech support will get you going.
It's a very simple and easily reversible mod. I did it on my Super J and on my AB-1 fiver. I might take a few minutes and do it on the sixer just to see if I like it. I'm very happy with the way the sixer is sounding now, so there isn't any rush. I think it would be better to add a switch, if that's possible, and have both options. I'm going to check into that.
The change to series moves you towards the P sound. You don't get all the way there, the upper mids and highs are not as pronounced, but the fatter, deeper part of the P sound is there. I liked the improvement on both basses, and based on that simple bit of experimenting, moved to P tone pickups when they became available.
The P tones have quite a bit more mid and upper range presence and are somewhat hotter pickups. I end up rolling the tone off, but really enjoy the solid punch. If a P tone was to become available for the six strings, I'd probably jump right on it. As it is, I'm content with the sixer's sound. Mine is an AB-1 and is passive, but has the blue Eqcube switch, so there is no lack of tonal variety available.
With a active bass there would be even more variety.