That makes sense. And also, Davik most likely fought against the Mandalorians during the Taris Siege seven years before KOTOR takes place. I could see him getting some official commendations from the Tarisian government for this.
I'm afraid not as the script would need new complicated data to make that work.
Are both lightsabers normal or can the player have a normal and short lightsaber in each hand? If the latter, which lightsaber is held in what hand? Is the short lightsaber in the left or the right hand? And if the player does have a normal and short lightsaber does which hand will Atris wield the normal and short lightsaber?
Plus, the ultimate reason the Exile cannot have dual lightsabers is because in the Jedi Council scene Vrook refers to the players weapon as "Your lightsaber, surrender it to us" (suggesting the player only has one weapon) and Atris also says "I have always kept it" (Again suggesting the Exile had only one lightsaber).
I'm sorry if this wasn't what you were expecting.