Another option would be skipping the secret quest via Grim Internals teleport. It’s technically a cheat but if you already had the items required to open the rift, you don’t have to feel bad about it 
Install Grim Internals and add this line to your GrimInternals_TeleportList.txt
Lokarr, -1024.58, 24.80, -5325.08,
Select this entry from the teleport list in the configurator and it will teleport you to the shrine at the beginning of the Sanctum Of The Chosen. From there it’s just a short walk to Lokarr’s arena, the only thing that’s skipped is the ghost in Malmouth outskirts who needs the 3 items to open the rift.