I don't know about Shiho but if they do arrive then Raku will not leave Hinagiku's side for even a second. She's less of a combatant than Furījia, it'd actually be her first mission outside the village. She's purely a medical-nin at this point.I’m not against Raku and Shiho going but both just doesn’t seem realistic. If the Leaf is sending backup, they could easily send out a few chunin, even jonin instead of children. They could be a liability considering they’re going against the other major villages and potentially after a jinchuriki.
Disregarding that though, the other option would to just say he was there the whole time.