Leave it as is. just file the pickup ring or pick guard to fit it
the case is a shield. in fact the best shield available
and just solder some extensions on and heat shrink them
trust me on this. i had the same problem with the one i had
and while i was able to make it work i would not recommend it
the case is filled with epoxy making it extremely difficult to get to the solder points
which are very short and small gauge leads that can break very easily