Sure, but there are already rules in sports to cover this.I disagree.
Having his balls cut off, his dick turned inside out and having tits installed still leaves big long orangutang arms on that fencer. Noo amount of skill can overcome that advantage in a game like fencing.
He-she has no more business competing against women than a 6' tall 18 year old playing hockey against an 8 year old Pee Wee player.
Its not a major issue destroying olympic, pro or even amateur sports.