Caches for Blacksmith, Armourer & Arcanist

During the campaign, currency items for improving gear quality felt rare. I would like to suggest to add new caches that are a collection of tools for the Blacksmith, Armourer and Arcanist. These caches would come in three varieties as shown below and dropped from rare monsters and rare chests...

Blacksmith's Cache
• Used to drop 3-5 Blacksmith Whetstones

Armourer's Cache
• Used to drop 3-5 Armourer Scraps

Arcanist's Cache
• Used to drop 3-5 Arcanist Etchers

These caches could also be a quest reward where the player chooses only one. This would help introduce upgrading gear.