Proving it is done. It is already admitted to by confession. That is likely the source of any confusion. The proof that these chief "judges" and "justices" have deviant oaths is on the face of the oaths. There are even citations on the oaths and if you look up those statutes you will see that the oaths are deviant from the form prescribed by law.
"Judge" WOLSKI in the US Court of Federal Claims confessed to altering the oaths from prescribed form too.