They don't really have any reason to bring them back on as Okamura's offer series and Kimatsu test are both one-time specials.
Also, I doubt the girls have any free time judging by their schedule the past year, and they don't even appear in CMs anymore so tricking them into another chuukan/kimatsu test would be impossible.
The closest thing we've got recently was Nono appearing in a special, but she's a graduate. (This was way before the marriage, though.)