bbdb-mua-display-recipients keybinding in bbdb-gnus.el

I'm about to use/define a key to add an email address entry whenever I
write to someone who is not already in bbdb.

something like ":" bbdb-mua-display-sender, but then for
recipients. (Naturally) the function alread exists
bbdb-mua-display-recipients (thanks!) and there is a line in
bbdb-gnus.el ready to be uncommented

;; (define-key gnus-summary-mode-map "'" 'bbdb-mua-display-recipients

What about gnus-article-mode?

Would it be possible to re-define ":" to that it would do
bbdb-mua-display-sender and bbdb-mua-display-recipients in Gnus' article
mode and summary mode? Or is that confusing?