Hrmm, Harley lives by Harlow and she goes to a gymnastics specific gym so there is a chance that she and Dick might be neighbors? Casual run in/cup of sugar types of chaps?
Vicki and him could run in and there is a chance for reportage- especially if his costume looks more like the Batman. Either that or perhaps he can save her at some point while she gets herself into trouble snooping around.
Selina and him....I have no clue but that could ALWAYS be hilarious.