Did you know that capes appearing in soul pyres only became widely known recently? That's because they are incredibly rare. If the cape drop rate was the same for soul pyres and reives, cape-hunting players would just ignore reives and cleave mobs for pyres. I've only heard of one instance ever of a cape even loading in a soul pyre. Let me know if you've heard of other accounts.
I did misread your post, I see now. But I still think it's a terrible idea to do anything in Dho gates.