Well, another option if you guys are trying to figure out what to do with Beni is to stall.
Given how torn she is right now, I could see her refusing to let Natsuo wing her, citing that she wants to "fix" him first.
Assuming that she knows about Musubi's relationship with Karasuba, and she figures out that Ichigo lives in the same place, she might start dropping by to spar with Musubi, sayign that she wants to make sure that Karasuba gets the fight she wants.
And of course, as payment, she might request that a certain orange haired Ashikabi give his opinion on various outfits/actions, so she can "fix" Natsuo.
...of course, now that I've thought about it, that'll basically force you to pair them up, because the alternative would be for Natsuo to get her, Beni to realize that he doesn't love her, go to her room, and cry herself to sleep...
Added bonus for Benitsubasa/Ichigo: If Urahara ever talks to his zanpakto when's she's around, she'll probably hit him for calling her Benihime. After all, only Ichigo is allowed to give her cute nicknames.