The new Quillmane code is absolutely able to cracked like the previous one. It's not as easy, but it's not that much harder. Whereas 1 bard was fine before, I'd suggest 2 bards now.
I used to sell Quillmane cloaks back around 2015 (
Here is one thread) and it was silly. 2 triggers with about five spawn routes each was low effort, to put it mildly.
Spoiler alert - the key to finding the new triggers lies in the spawn time. Use this to locate one, then follow it's route, remembering an NPC can spawn at any point of it's route. Once you've located one trigger, you can now use track order to find the next. Bard + Ranger is ideal for this. Find it, Highsun, follow it, repeat.
It takes patience, but it's not that hard. AoEing the entire zone is just going to take longer.