[SPOILERS] Job specific dialogue in the MSQ?

[Rannie]

And now I'm kicking myself for not paying attention to the quest title, 'cause I've been doing the MSQ as Monk, but would have liked to switch back to WHM for this scene...

You're in luck since all you have to do is switch to healer and go to an inn and rewatch the cutscene in the journal. When you do that it will still work with the job you chose. It's why I checked it out afterwards by switching to nin.