Ty for this awesome list, I would see Augur Stone (because if we need it, we have to quit crafting panel and go to see miyani, boring) and Vision crystal (minor and classical) too.
Consider removing Unidentified Fossilized Insect and have someone make it so its vendor equivalent (3x Sandy Bag of Gear) drops instead once the Ambrite weapons collection is completed. Would probably make Dry Top-dedicated guilds even happier.
Move Glint’s Bastion collection achievement item “Crystalized Scarab” to Buried Locked Chests or a different vendor.
Oooh, that reminds me something ^^ :
https://www.reddit.com/r/Guildwars2/comments/6a5bkg/qol_change_ambrite_fossilized_insect_reward_in/