HELP - Hacking Boss Conversations in Binding Blade

[Forpocalypse]

A couple years ago, I began working on a hack in which Guinevere was implemented as a fully playable character and can be played as for whenever she is with Roy, (So really everywhere but the Western Isles) but to be fully content, I have to add boss conversations. Somehow, I managed to create a boss conversation between her and Narcian about a year ago, and I've been pulling my hair out trying to figure out how to do it again. Not having her talk to Zephiel upon initiating combat with him would leave a bad taste in my mouth. And yeah, I know it could be argued that Guinevere fighting against Bern more actively is wholly against her character, but my Guinevere is a bit different from the canon one. (:

I have a good amount of experience with Event Assembler, Mappy, Zahlman's Song Editor (lol), Nightmare 2.0, and FEditor, but I'm not sure where to begin anymore. I've gotten event editing down to a science (again, aside from boss conversations) and I know how to edit the text WITHIN the pre-existing boss conversations (ex. I can make Lilina talk Legance's ear off...) I just don't know how to create new boss conversations anymore. I want to finish this project, if only for my own personal satisfaction, though I do plan on publishing it upon completion. 

So, to reiterate, I'm hoping to add new, unique, boss conversations, but can't remember how to do that. I didn't want to have to ask, but i've about given up on the project and don't want to let it die quite yet. If anyone knows how to insert a new boss conversation somewhere in FE6, that would be a tremendous help. Thanks sooo much! Any little bit of knowledge helps. (: