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Unfortunately according to the way that Additional Reources is to be interpreted, if it is not listed in the Additional Resources entry as either being legal or not legal for play, it is not legal. Sacred Implements are used by an archetype which is legal so it may have been an oversight for mention in either Additional Resources or Campaign Clarifications. It may be an upcoming chronicle item as well (complete theory).
In other words, they are not legal but I do recommend waiting for other answers before you proceed.