While there are many players out there that have cleared every extreme trial and a subset of those that could be dropped in any of the dozens extreme trials and remember every mechanic, where to stand, and how to maximize their DPS, I don't think the general player population can manage that. Even those that HAVE cleared all of these.

Think back to some of the PF you've probably been in to farm Ex. People start getting antsy when the party wipes more than once. And that's on current content that people have down to muscle memory because they've run it a dozen times per day. Now open that up to all of the trials out there... the reward better be good. And it could just be that the reward you mention could do it. Maybe make it 5 universal totems. That might be the risk/reward that people are looking for to risk dealing with a few wipes before everyone remembers what to do.