FFVI: Divergent Paths

The lack of space shouldn’t be a problem after I expand the rom, correct?

Expanding the ROM will give you more dialogue space, but I don't know if it gives you any more dialogue pointers.  Since you're working strictly with editors and not changing events in hex (as you explained in an earlier post), that shouldn't be a problem, though.

Be warned, there are some strings that get used in multiple spots in the game; adding character attribution to these strings will make it show up in incorrect and innocuous places.  For instance, "GRANDPA!" gets used by Relm offscreen before she's named, and again when you meet Gungho.  Were you to try to attribute the earlier line to "Sketcher" or "Painter", that attribution would show up again in the World of Ruin.  I think the line "HALT" has a similar problem.

@PowerPanda
With regards to your question about garbled Mog, I read in one of the RHDN reviews that someone had encountered that problem.  Although... it looks like it might be SarahGa's review, so perhaps it was lingering damage on the save from an earlier version.