Having lots and lots of black hole talismans in a double chest makes the organization kinda annoying. So i have 2 suggestions of QoL to help organizing black hole talismans:
coloring: placing the talisman with a dye on a crafting grid should color it kinda like shulker boxes;
small block visual: having an indicator showing which block the talisman is linked to in the corner of the sprite would be great. I think this way is harder to implement because it changes the item's sprite in the inventory.