I have a 385 version of the trinket and I don't see me getting an upgrade anytime soon. I add in the code manually, but there have been so many updates lately it seems like I have to edit the file every day.

Code to add to Classes.lua:

all:RegisterAbility( "kezan_stamped_bijou", { cast = 0, cooldown = 60, gcd = "off", item = 165662, toggle = "cooldowns", } )

Will add the missing trinket.

Will appear in 8.1.5-04.