The thing about the Druchii is they're very very bad news if you live on a coastline or try to travel by sea, but are almost never a concern if you don't. So, here's Point One of modern Empire Naval Policy:
How much coastline does the Empire have? Less than any non-Dwarven polity on the planet. Why? Because Marienburg took two thirds of the coastline when it seceded. See Point One.
How many significant towns does the Empire have on that coastline? Only one. Why? Because Marienburg sabotaged the other two towns that the Empire tried to establish on it. See Point One.
Is that one town at all vulnerable? No, because half the fleet is based there because there's only two places in the Empire that can actually maintain seagoing vessels any more because most of that infrastructure was in Marienburg. See Point One.
How much naval force projection does the Empire try to do? Not much, because the other half of the fleet is based in Altdorf and has to pay ruinous tolls to get out to sea. See Point One.
How much naval trade does the Empire try to do? See above, and then see Point One.
So, do the Druchii connect to the Empire's foreign policy in any other way? Well, they're infamously opposed to the Asur, whose involvement in the Old World involves sending three dudes to protect the Old World against the Everchosen and then sending a fuckload more dudes to help slaughter an Imperial Army in the Battle of Grootscher Marsh to support Marienburg's secession. See Point One.
Which is particularly prominent in a lot of minds currently, because the only reason Marienburg feels confident to threaten a full blockade of the Empire in response to the canals is because of the continued protection of the Asur. Which also means that in a lot of minds right now, Point One of Empire Naval Policy is echoing very loudly.
Which means that right now a
concussed toddler could make major diplomatic inroads on behalf of Naggaroth if you could teach it to reliably babble those five syllables in the correct order.