Make the artifact /uses into procs. Make requirements that artifacts must be applied to a specific piece of jewelry or armor. In some cases like the shades of the mist, you could require the skin to be applied first before one can put the proc on a cloak. So, an artifact proc is limited to certain pieces of jewelry/armor/weapons and it requires a certain model requiring BPs and we could make it require feathers and platinum as well to acquire these. Create a ToA merchant that sells these procs exclusively