Why the assumption that the trials in HPMoR are going to be even remotely similar to canon? All we know at this point is that the Mirror of Erised plays a part, but we don't know what that part is, or what any of the other trials are, etc. Using canon information to make deductions about HPMoR has proven a less-than-reliable method in the past, and EY's essay on originality suggests to me that the obstacles will in fact be radically different from those in canon.