How come there's Coupled Arcana and Coupled Phenomena as mythic path abilities for an Archmage but no divine equivalent for a Hierophant? I would homebrew something like this:
New Hierophant 1st Tier Path Ability
Twin Graces (Su): Whenever you spend a standard action, move action, or swift action to activate a domain power, revelation, warpriest blessing, shaman spirit power, or shaman hex, you can also activate an ability that uses mythic power as a free action. The mythic ability you activate must require the same action type as the other ability you activated or faster (a swift action is faster than a move action, and a move action is faster than a standard action).