In theory its not a difficult thing to do. All of that information is, as a rule, at the end of the routine for space saving purposes because the message is loaded by the chosen spell for the effect. It would take a little bit of clever coding, but it can be done.
So, in other news I figured out what makes Cecil and Paladin Cecil the de facto main characters and its a very simple, stupidly simple explanation...
In the event scripts themselves there is oftentimes near the start "Change Character Graphic to 1 (01)" for Dark Knight Cecil and once the Paladin is expected to be in the party that changes to "Change Character Graphic to 11 (0B)". So in essence with enough elbow grease you can have Anyone be the main character... if you're willing to change every instance of the "Change Character Graphic to X" This escaped my noticed because I thought it was looking at something at the end of an address. And with that I think I will soon be able to release my Solo Rydia Challenge Patch. It's a very simple patch with the only purpose is in taking a Child Rydia through the entire game alone.
Good news, main character doesn't Have to be Cecil. Bad news, it means I'll have to look through Every Paladin event and change every instance "Character Graphic 11" to Nothing.
Give and take, as they say.