i've got an old jazz that has a large and unusual rear route. to make things look right, I need to enlarge the route. I originally thought about any old MM shaped humbucker. then I thought about taking a couple of jazz pickups and whacking the ears off two sides, gluing them together like a Rosco Beck pickup. My only concern either way is with running a single coil in the neck position. I suppose a stacked humbucker in a jazz shape would be best to keep noise to a minimum. My only concern about the doubled Jazz pickkup idea is that once I route for ears in front and behind the pickup, I would probably never have a different option for a drop-in that would look right. OTOH, If I start with a standard MM shape, I would have different options down the road. Any ideas or suggestions in my J+MM adventure?