Hello,
I have recently discovered this video, which got me interested in a field of speech synthesis. I have researched this subject and, as it turns out, today technology is quite capable of producing semi-realistic speech, which, I believe, is more than good enough for modders to do voice-overs. I was able to replicate results shown in this video, and while at it, made some Python scripts and sort of a guide on how to train a model on Bastila's (or any other character's) voice. Here's the link:
https://github.com/seedhartha/reone/wiki/TTS-Research
Training an AI model is a tedious and error-prone process, but this step can be avoided altogether if you use a pre-trained model. I'm not sure I want to make my models public due to legal concerns, but contact me if you're interested in the topic (i.e. you need a voice-over for your mod), and we can work something out.