Not having ever seen one of these I am just guessing.
Have been musing on this and suspect the champher may be merely a de-burring operation!
Why not try just that on one sample and try it out! If it is insufficient, the champher can be made bigger!
Hope that helps and I can't see how it may do any harm!
Pardon me for offering an off-the-wall solution!
atvb
David