I don't know, I still think that even if Dagliash goes perfectly well for the Consult there is essentially near zero chance that Kellhus himself is killed. The aim is likely to reduce the Ordeal itself to near inoperability, so that when Kellhus arrives, he will not be aided. Granted, near zero is not zero, but the Consult likely has to risk it, because they can't allow the Ordeal to just walk up to the door, that has too many confounding variables to account for really.
So, I think it's a little odd, no doubt, but it has some sense to it. Is it risky? Yes. But is it more or less risky than just letting Kellhus do whatever he wants? Unclear, but likely not too much either way.
Another thing to consider is that the Consult still is playing some manner of charades. They have to "pretend" that they want to kill Kellhus, because deliberately avoiding killing him would be a dead giveaway of their whole plan. Which means Kellhus might suss it out and fail to show up. The crux might well be that they don't know that Kellhus' plan is specifically to waltz in regardless of what they do, so they have to lure him somehow and not tip their hand.
It might work better in thinking that Dagliash is really a risky demonstration. I think they realize that post-Metagnosis, they cannot possibly threaten Kellhus' person, so they take to a dog and pony show in order to convince him that they have the more effective way of dealing with the "Damnation problem." That isn't without some risk, but again, the allow Kellhus to realize that they have no interest in killing him is probably even more risky. Along with the fact that an intact Ordeal is likely a unneeded confounding variable in the whole plan.