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I think possible solution is change Arcane Shard with Dragonite Bar or some kind of mythic ingredient and for the ones that already crafted it, should be granted Arcane Shard in their inventory and...

They can grand Arcane Shard to those who crafted it, as they did in Winter Event, when the Massive locked needed 3 Massive Twilight lockeds, when they changed it back to 1 Massive Twilight lock it...

I totally agree with you, you made a point here. Anyways if you closely read the Arcane Shard description you will see why am i writing this now.
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It says used to craft items of Arcane...