I got it working with lgp tools. All I did was backup char.lgp in the field folder, then extracted all of the char.lgp files after opening it, to another folder. Once that was done, I just copy and pasted all of the modified files in the folder with the extracted char files. Then i created a new lgp file in lgp tools, and chose that folder to create the new one, then chose the original char.lgp (not the backed up one) as the file to save to, and it worked. I'm sure there's probably an easier way, but that's just how I ended up doing it.
Also, Reunion, how does one go about replacing the low res cloud battle model with the high res one? I'm thinking it would be a bit easier seeing as how the high res one was a battle model to begin with, right?
EDIT: I just noticed something Reunion, when viewing the model data for all the characters, the model of cloud with his sword doesn't get replaced, so its going to revert back to that model for those animations, right?