(I would actually love to try that one day)
Well, to do that in the game, that would require hacking into the game's code, searching through hexes to find the relevant bits of data that represent the strings and voice lines of the game, and then you have to rearrange all of those bits to the relevant spots without breaking anything else in the game.
To make it less risky, it could perhaps be possible to decompile the game which involves taking the binary code of the finalised executable and converting it into a programming language and asset files, from there you can perhaps find any text documents or text files that contain the lines you need, and from there. Then you need to recompile the game into an executable to test. If you get anything wrong, you'd have to do everything all over again.
Do I get bonus points for providing the actual answer?