Relic weapons and the armoire?

[Jeykama]

That's not quite how the Zeta replicas work.
Normally you need to have the Zeta in your possession in order to trigger Drake to show its replica series. If you convert it to Umbral/Astral Nodules via Syndony (Soul Without Life quest not required apart from unlocking her options), that unlocks the ability to purchase that Zeta's replicas from Drake without needing to own it. Either way, it only unlocks replicas of that particular Zeta, not all of them. You still need to create all of them in order to unlock all the weapons' replicas.

As for Anima, each respective replica is unlocked upon completing each step's progress. Completing the Lux completes each replica set as a matter of course.

Eurekan weapons only have replicas for the form it takes upon completing each zone ( -Anemos, -Pagos etc.) Unfortunately there are no replicas of the steps inbetween.