So, unlikely this will ever be done or even read, but:
Would be nice to have an npc coded that could be activated for firesales that will offer previous kachua key loot tables if you bring a kachua ket to it.
Tldr: coded like boxter but rather than 2 items from previous kachua, you bring it a key.
Then toggle it on during firesales and back off when they are done.