I tried to use a hex editor (Thank you for the assistance), but, it displays the dialogue in the same vein as opening it with wordpad : broken words mixed with random characters. I do not find how it could possibly be modified directly in this manner, especially since the dialogue is not displayed (formatted/structured) how it is shown in game.
If I use the Japanese version of the dialogue file for that specific scene, I can somewhat comfortably fit what I need, since it allots more character space than the English version (not being able to change the name tags from Japanese to English a minor inconvenience). However, after editing it with the SOALEditor, it breaks the scene while in the game.
The editor also makes a few other issues to the dialogue files throughout (rarely adding characters where there should not be or completely replacing words. This only shows up in game and not in the editor).
I have been in contact with the author of the SOALEditor. They did manage to modify the English script file to allow more characters where I required. However, it makes that scene break. They are currently not able to understand the reason. I have brought the other concerns to their attention and they have been assisting me when they can, but they appear to be busy with other matters at the moment and I do not wish to burden them any further.
Maeson is on vacation? I do not wish to burden them.
I do not believe they would be able to assist, though. They modified gameplay related data that is in the Start.dol (where none of the game's story dialogue is stored). Only text related to items, spells, discoveries, journal and other menu-based elements are in there. It appeared easy to read and modify (unlike the story dialogue). They also used specially configured tools that target the Start.dol.
I am frustrated. I revised the entire English script, but I cannot implement it properly in the game. This kind of work is never easy, I suppose. I never modified a game before, so perhaps it is also my inexperience.
I hope I do not appear ungrateful, I am truly thankful for everyone's assistance and the tools provided here. I am merely upset with myself, I wish I was not so technically declined.