It’s something that keeps coming in here through the years. I can assure you that if you play for once 24 hours straight you’ll get every single named thrall or crafter a camp provides. But because this is impossible and pointless to be done, getting a named Derketo priest is really hard. But they spawn, every day, just not at the time you play.
Now, i would suggest once more, purges to give named crafters and priests in the end inside the loot chest. Having more options to gain named crafters is always better, but difficult options, not the khitan trades.