In regards to Ragnarok, as I have said before, Succession is compatible with anything that doesn't change the field.fs files. That makes it compatible with almost all graphical mods, and around 85% of Ragnarok.
I use Ragnarok regularly, and love it, and Succession is compatible with all of the battle related changes, and character/ability/junction changes. But any event related changes (extra battles, quests, item rewards, drawpoints, card locations) are, very sadly, not compatible at this point.
Oh man, just saw this, right the field.fs files. Would it be a big undertaking for the creator of Ragnarok to insert your dialogue in their mod and compile the field files?