I think you should give in to your Keiko bunnies. No matter how little you knows about Japanese culture, it will be still more than what the screenwriters displayed. I did a little bit of research in the area - barely scratching the surface, mind you - and it's fascinating.

Besides, 300 years in the future things might have loosened up a bit, even in Japan, eh? And Keiko deserves to get more screentime. There is one DS9 novel in which she plays an important role, I'll look up which one it is for you if you want me to do so.