in my opinion, to avoid being attacked by Vlad we should:
1) hyper fortify our borders
2) hyper intensify the recruitment campaigns for the iron companies and expand the apparatus of our army
3) expand and intensify war production (weapons and black powder)
4) with our research faculties for war research (with particular attention to incendiary weapons, including flamethrowers and incendiary bombs)
To fund all of this, I would argue that we need to intensify trade relationships with nations that are not in a prolonged state of war, including: the Dwarven Karak, Tilean city-states, Estalian city-states, Araby, Bretonnia, and Border Princes.
to do this there are two options:
1) For a portion of the proceeds, we use business contacts from Fiorella's hometown "Trantio" to raise revenue to fund our plans.
or
2) we conquer or take or corrupt Tordorno, to make it our trading base outside the empire (with an agreement to secure Winter's Teeth Pass for a share of the profits with Karak Hirn)
To expand on your ideas:
Key places to fortify are Nuln and Jengen. Nuln is fine but could become a fortress city if we invest in it. Jengen is currently only a protected village but is the only crossing from Averland into the soft underbelly of the province. If Averland ever fell we would be screwed. Maybe getting some dwarfs to help could speed up and and improve the process?
Investing in the Imperial Gunnery School's production of armaments would also help massively. We can become the premier exporter of firearms in the Empire and use our supply of guns to help diplomacy in the Empire and beyond. An action we haven't taken yet is upgrading our free companies. If we can build a stockpile of guns we could severely increase their combat capabilities. Every man counts against the undead. When Vlad gets his doomstacks I don't think the Iron Companies only are going to cut it in the defense of Wissenland.
We also lack a heavy cavalry component in our army. Light cav is fine for running down chaff but I wouldn't put them up against a bunch of vampire knights and expect them to do a competent job, nevermind any larger undead monsters. We can either develop an Iron Company ourselves, lean on the expertise of Averland to help us do that, or invite a knightly order to make a chapterhouse in the province.
Edit: What would be the requirements for founding a knightly order or inviting one? Is there an action we could take
@Warkeymon? What would be the benefits and drawbacks of doing that versus setting up an Iron Company of heavy cav?
A good stopgap for making our light cav more effective at fighting undead is upgrading them with firearms and turn them into pistoliers/outriders. That will give them better punching power. Our army currently is too static with the amount of cav we have.
Securing a deal with Karak Hirn to co-guard the Winter's Teeth Pass and secure a colony in the Borderlands along the nearest major river is also a great idea. If we can secure safe river travel in the Borderlands through the River Yetzin and on to one of the larger rivers and funnel trade through the Winter's Teeth pass we could really undercut Marienburg's hold on trade in the Reik river basin. We also won't need to course all our international trade through the river of echoes into Trantio. Approaching Barak Varr to help in this initiative would help with securing river access.
Honestly there's a lot we could do. We just lack the dice for it most of the time. Especially when engaging with foreign states need at minimum 2 dice to succeed with regularity.
Edit: Not related to Vlad but we should aim to double our income of marks. An expedition currently costs 16900 marks so if we want to expand our army, fund our military campaigns and still have money to do other stuff in a turn without inching closer and closer to a deficit, profits need to go up. Stonks!