If you know anyone in the medical profession, try to get a set of non-serrated hemostat clamps (these are used in operations but are thrown out afterward). Barring this, get a set of needle nose pliers (non-serrated).
After you separate the PE part from the fret, clamp the part in your hemostat or pliers, with the edge requiring clean up exposed about 1mm. Then gently go over the part needed to be removed with a file, along the length of the part. Very easy to do and the part doesn't get bent.