I think if they just added Riftcinder/dross and Heavy Metal Plates to the Goblin in Reisenjima that would be a huge benefit.

They could easily do like 3000 merits for a Riftcinder or Riftdross and like 500 merits for a Heavy Metal Plate, and even that would be a HUGE benefit to increasing supply of these items. They really need to expand on what items the Reisenjima Goblin exchanges in general; the Voidwatch selection is basically limited to grinding endlessly for a glow body/weapon.