Unless there is a scene the Lightsider gets their Lightsaber back for helping Redeem Atris, then that would be pretty cool restoration. I would really like to use this mod in the future if the mod is a TSLPatcher isn't it just adding content to a scene the RCM team isn't even using? Even if RCM does give it back at end game (honestly not sure how that works) speaking from a Lightside point of view, afaik we don't even get Atris's Lightsaber. You are technically working for her and would serve her better with a lightsaber.
Not to mention her obvious nefarious intentions/reasons, she wants you back in the galaxy. Atris knows your being chased by the Sith, she is asking for your help to gather the Jedi Masters on Dantooine and giving you your ship back. I really like the idea of getting it back at the first meeting, at least if your on the Lightside (can't speak for Dark, never played it). I'm not using it this game for the fear of breaking RCM, atm.
In regards to using Get You Lightsaber back from Atris, I disagree it's unnecessary.