Well then, now that I know our feasible courses of action, analysis time.
[ ] The High King could make it so
This is likely to cause discontent within the Karaz Ankor.
Ha ha ha ha noooooooo. That would either kill Belegar of cause him to revolt. Nuuh, not a chance, nosireee, that is the worst option without an equal.
[ ] For sufficient concessions
This would weaken the Empire.
Somewhat traitorous, but I do not care about that as much as I care about the fact the Empire is swarmed with problems that may become the dawi problems if the empire cracks. Not a wise choice, we need strong forces of order.
[ ] They can make up for the loss in trade
This would weaken the Karaz Ankor and the Empire until the canals are complete.
A better compromise, maybe? Still leaves a sour taste but it may be the option that weakens the forces of order the least. Let's jot this down an option number 1.
[ ] No, but they could help break the blockade
Barak Varr is the main force behind the project, and would not hesitate to deploy their navy in support of the Empire's to reopen trade routes.
That would be the least bloody way to do it while stucking up to Marienburg, as well as the most dwarvish way. If Marienburg escalates, we can convince the Dawi to escalate without lies. Lets's jot that as option number 2.
[ ] No, but they would fight beside you
This could easily be spun as Elven sabotage of a Dwarven project. Dwarven pride would have the Throngs march alongside the Imperial Army, and Marienburg could be reclaimed.
Lying to the dwarves? Hahahahaha noooooo.
[ ] No, they cannot be dissuaded
It's hard to say what this would result in.
Significantly worse than "I do not know", gains us nothing but danger.
[ ] I don't know
Wash your hands of the matter.
Best way to answer if some flaw is found in option 1 and 2, let's jot it down as plan B.
So, as far as I am concerned the choice is between
[ ] No, but they could help break the blockade
or
[ ] They can make up for the loss in trade
I cannot, in truth, decide which of those are better, so unless someone sways me, I will be approval voting both. Should both of those have significant flaws, however, I will go with plan B, which is "I don't know".