Steam has an option to disable individual DLC purchases.
- Open Steam
- Right click on Siralim 2 and go to Properties
- Go to the DLC tab
- Uncheck “Siralim 2 - Unlock All Skins (Cosmetic Only)” in the installed column.
- Hit the close button.
- Close and reopen the game.
- Discard undesired skins from Consumables
- Skins don’t respawn