[(Survey) Are you for (+) or against (-) an item for changing a Riven Attribute?]

The system I've always envisaged was as follows :

• A crafted item from a monthly/weekly fight (Vome/Foss stuff) drops for players and infuses a riven with Infested kuva, requiring Kuva (100k) and tokens farmable from nodes related to this boss fight.
• The modified riven is untradeable
• The first modification requires a riven of the same weapon type  (Shotgun/Rifle/Melee/Zaw/Kitgun/Archgun/Companion/Companion weapon) having the desired stat already rolled. eg: Critical Chance.
  The riven then becomes modified.
• Each modification beyond the first one requires one crafted item and an additional fee of kuva (an additional 100k, 200k, 400k) and like beforehand mentioned a Riven of the same weapon type having the desired stat. eg: Critical damage
• You can roll the desired riven and the non-locked/modified stats will roll normally
• Wanting to unlock a riven rolls the locked stat and that consumed crafted item is lost permanently.
• The riven will only become tradeable again if it has no locked stat.

This will create an incentive to farm content, not render Kuva useless, will solve a bit of Riven capacity problem and will keep old god rolls as pricy as they were.