Auto approve og subscriber if invite comes from og admin

I'm wondering if there's already a solution to this one.

For moderated ogs I'm looking for a way to have a user subscribed to the og automatically if the invitation originates from the og admin. It seems redundant to ask a new user to submit "additional details", or even click a subscribe link, then for an og admin to review and then approve/deny, if an invite came from the same og admin in the first place.

Clearly, the existing workflow makes complete sense for new users subscribing themselves or for invites from other, non-og admin subscribers.