I mean, he's already heavily involved in the intelligence community thanks to his connection to Argus. Give him a mini and establish that he's one of the DCU's top spies. It would be an interesting contrast between Diana's goddess of truth role as well, having her love interest be in the business of trading in secrets.

Honestly, this is kinda what I feel Diana needs more of in her supporting cast, anyway: people who offer differing points of view.