...actually, when you list out that point, it already kind of settles things, doesn't it. Keltham had other points, on this list, like, point, it maybe made sense to think he could be a Protagonist in Cheliax when it was possible he was in that kind of story but he's clearly not actually in that kind of story.
Point, one month is just not enough time and if he wants to have any chance of pushing Osirion hard during that time he's going to need all of the headband and all of the augmentation spells and Nefreti's wine and whatever exists in the way of magical memory aids.
Point, Cheliax was withholding those aids from him due to their lack of true cooperation with him, because it would have let him pierce the Conspiracy. If you don't seize advantages like that for the side of Coordination, then how is the side of Light supposed to win, exactly?
Point, Keltham has noticed how harshly he's been punished for, trying to suspend judgment, delay investigating, not jump to conclusions; and for the last two days he's been trying out the virtue of Speed in place of the opposed virtue of Caution, but - but Keltham is not sure that it is working. He's held off on doing anything irrevocable, for any conclusion he's jumped to, except for giving superweapons under oath-seal to the cleric of Iomedae, and that decision followed from considering this layer of reality to be real at all. But there are contracts to be created tomorrow, and too much of his theorizing is tropes running ahead of the causality underneath it, and theories that do not feel like they have snapped solidly and terribly into place.
All of which only goes to say, in the end, that if the benefits of cognitive enhancement were costless, you sure would want them, yep, they're not trivial, nope they are not.