9 months ago - [Fatshark] Hedge - Direct link
https://steamcommunity.com/games/1361210/announcements/detail/3683433439100289448
You can now select the exact perk at any tier that you wish for an item (weapon or curio). There is one direct cost to be made for each refine action. This cost will remain flat throughout refining and will be reduced for lower level characters

As with the other actions at the Shrine, the amount of required resources will scale both depending on the base item rating of the weapon and on the tier of perk being selected to refine into.