Yup. I propose this. Sparks need more use, and resetting high end items falls exactly in line with that as an end-game endeavor.
Two things need to occur:
- Tempers now have a choice to replace a Temper (including a blank slot)
- +5 Rolls for a Spark
Does two things: players can reroll to attempt to gain a higher roll of the same Temper in a meaningful manner, and it allows a player to invest Sparks in their items to perfect them.