I'm fairly certain that unlocking collectibles (the things that earn you scripts) is by character, not job. So you only need to do the quest once. I barely remembered the quest to unlock them but being an omnicrafter who leveled almost all the DoH/DoL simultaneously, I'm pretty sure that doing the same unlock quest over and over and over in one go would have stuck in my memory. If I'm wrong, then you just need to check Revenant's Toll for the quest from the femroe by the tent next to the poetics vendors' stall, right up the hill from the Aetheryte. If I recall correctly, the quests in Foundation and Idyllshire are breadcrumbs to lead you there if you don't find the quest on your own.