Trade in signature stones for awakening gems?

Does everyone remember when, in the shop, we could trade in lesser potions and revives for higher level ones? For example, two level one healing potions for a level two healing potion? I had an idea similar to this: ten basic signature stones for a basic awakening gem. I'd imagine 5-star awakening gems would be locked to uncollected, and if there is an option for a 6-star awakening gem, it would be locked to cavalier. Naturally there would be a purchase limit so as to not make this trade overpowered for players with a ton of signature stones. Anyway, let me know what you guys think of this!
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