” Yes, if it was clear AT THAT TIME that person didn’t mean it when they verbally accepted ol malchus shomayim,then it is not a good geirus. However, if it was so clear we can assume an Orthodox Rabbi would not have done the geirus.”
No we cannot assume that someone who calls himself an Orthodox Rabbi would not have done an insincere geirus. R. Druckman in Israel, for example, did many hocus pocus geirus on insincere Gentiles who hardly even put up a pretense that they will be religious.
” If a person was “conning” a well-meaning rav, then the con is on them because after 120 they will have to face Judgment as a Jew who is michuyiv in 613 Mitzvos.”
That is simply absolutely incorrect. If he wasn’t mekabel the mitzvos the conversion was never valid. For example, if the Church sets up a spy to infiltrate the Jews and recruits a sincere Christian to pretend he wants to convert to Judaism, and the infiltrator is successful in having an Orthodox Rabbi convert him, the Christian remains a gentile and never became a Jew. Despite conning the Rabbi.