I would argue that it’s impossible to remove the “fan edit-y” feeling of Leia, so I’m not sure why you brought up adding lines to begin with. I always thought the intention was to make her seem like an actual human being that doesn’t say a catchphrase every so often like a doll with a voice box.
I see those two things as the same? Hearing her say two lines in completely different tones within a few seconds sounds both like a fan edit and like a doll with a voice box. Soundboard Leia does not make her seem any more human just because she’s talking more. The goal is to integrate lines that feel believable. As with any fan edit change like this you try it out, and if you don’t buy it, you scrap it. Like, I’m not going to include footage from one of the animated Galaxy of Adventures shorts because I want more stuff with Kylo. Just because on paper it’s adding to the story doesn’t mean it actually works.
Once again, this is no fault of your work. And if you’re not bothered by it that’s okay. But I don’t see what is so hard to understand about my position (on this and other jarring changes that have been suggested).