I think that Dr/Prof Bar, Dr/Prof Foo Bar, Dr/Prof F. Bar, F. Bar, Bar, and, Foo would all be ways I'd expect to hear used to refer to an academic. The other options whilst all valid in casual conversation seem to me to be irrelevant and potentially confusing (which of the collaborators is your wife?).

Mr/Mrs Bar is entirely unacceptable of they are a Dr or a Prof, but acceptable if they do not.