Yep, Lelouch has already had the Et Tu Brute moment covered, between that and Suzaku turning him in to the Emperor for the KotR spot.
But yeah, come to think of it, that betrayal moment seems awfully reminiscent of the Ides of March with him out in the open, if not for the lack of a forewarning.
The thing is that Judas is a more commonly associated name with traitor, regardless of circumstances. Not to mention the whole thirty pieces of silver thing, with Japan being the proverbial silver. Though of course, Oghi, instead of being bribed, came up with the deal in order to escape guilt.
Looking past the assorted technicalities, I do think there may be a more apt and clever way to describe his form of traitordom (which is linked to Stool Pigeon, btw).
One general question, someone suggested that aside from Aki (who resembles Kallen to no small degree), the Yu-Gi-Oh! franchise has another Ersatz in Supreme King Judai of GX, whose outfit they say bears a slight resemblance to Zero, a High Collar Of Doom, only with really spiky armor.
Oh, and thanks for the congrats, though it's a low rank upgrade!