I'm with
@MomOTwins : It never hurts to ask. They might say no, but you might get exactly what you want.
I've seen the characters initiate special photo ops. Back in 2012 at DLR, you first met Periwinkle, Tinker Bell's sister, and then Tink in two different photo stops in Pixie Hollow. We thought it was finally our turn to meet Periwinkle as the family in front of us moved on to Tink, but Periwinkle asked us to wait a minute. She jumped over to Tink and cried, "Sister pic!" The family did in fact have two girls, and they got to pose back to back while Tink and Periwinkle posed wings to wings--and then the wings lit up in familial recognition just like they do in their movie! It wasn't even our moment, and it still felt special and magical.
I think there are enough odds they'll help you out that you should ask.