Pull the pickguard off if you haven't allready.

You may find a cavity that will accomodate a full fledged humbucker (ala a Tele Special). If you do something like that you're opening up many more possibilities for pickups. Hell, why not a P90 or P100? Even if the cavity isn't large enough, you can have the body and pickguard routed very easily.

The neck pickup cavity on my Deluxe Active Jazz Bass V is big enoug to EASILY accodate the EMG-45DC I plan to put into it eventually.