I saw a FB post from from a Rabbi (He is a fairly well known blogger) who asked for non Cohanic males to do a mitzvah.
It was unclear what the mitzvah was, but some did guess it had something to do with a funeral. (It actually was an unveling and he needed a Minyan)
Because it was a weekday and he is a Rabbi in California now, he had trouble getting a Minyan on Long Island so he posted on FB a request for people.
A bunch of OTDers (ex-chassidim) respoded yes including one who very outspoken about his OTDing and they offered to bring friends.
The OTDer even asked if he was wanted because of his OTDism and his outspokeness about it, the Rabbi said yes absolutely he should come.
The lesson that should be learned, is remember when you are throwing out the Baby, There is still a Yiddisha Neshma there.