I probably didn't put my point clearly enough:
My issue is with Slumbering Trinket owners being left behind on Tuesday. Yes, they already said they would add a vendor, but they also said:
This means anyone who crafted their Slumbering Trinket before next Tuesday will NOT be able to use it in the Legendary Armory. To make matters worse, Catmander Neko didn't even mention a date, so it could take a while for that vendor to be added.
My suggestion was, instead of a vendor (which seems to not be trivial to implement, considering it's not happening on Tuesday), or maybe in addition to the vendor, they should change the existing Mystic Forge recipes that we currently use to wake up Slumbering Trinkets, making them not require any achievement-gated items. This should be trivially easy to implement, as the recipes already exist, meaning it could potentially be added into this Tuesday's patch, resulting in Slumbering Trinket owners not being left behind.