For Herath and Eusdria, I'm going a little beyond that, adding some non-canon info in addition to the already well-known canon info, making them somewhat different and better adapted to the XV-XVI feel of the rest of the SC (especially the baronies, Renardy and Bellayne; and yes, please, ignore the Japanese things of Bellayne):
Alternate Eusdria
by Átila Pires dos SantosThis idea make it mainly M-Austria (there are some elements that points to it: its name (Eusdria sounds just like Austria), the heraldic black eagle, the description as a "holy empire", the Germanic culture, etc), but with a difference; instead of the Hattian M-High Germanic, it will use a M-Low Germanic. One common Low Germanic name is Sigismund, the monarch of Eusdria, with is a good thing. The other rulers, OTOH, don't make good matches. But they could be used nevertheless, or be used at the Eusdrian past. That's because my idea is to make it indeed the M-Carolingian Empire, but c. 650 AC.
This was a quite isolate region before 500 AC. It was inhabited by dwarves and elves, but the local SC power by that time, the Lawful Brotherhood, largely ignored and was ignored by the locals. That changed by c. 500 AC, when a Antalian tribe, allied with the LB, arrived at the region and established two kingdoms, Eusdria and Savaria. The elves and dwarves also had their own kingdoms (elven Mohesia and Frisonnia and dwarven Harstal), that reacted. The LB finally arrived, however, bringing peace among those followers of lawful Immortals and joining them against common enemies, the goblinoids of the Yazak.
The LB, however, wasn't the same coherent and powerful religion it once was, and it didn't take long for the locals form their own church, using their traditional names for the Immortals instead of the generic one (their church, however, still bears a strong resemblance to the LB). The royal families also start to forge permanent alliances between them, eventually resulting with the strong House of Eusdria (yes, the M-Habsburgs). And, as we know, it triggered their neighbour states of Robrenn to band together as a confederated nation.
Eusdria is famous for its military orders. Despite being treated as the same thing, they're actually quite different from one another, except for the fact that they're at the service of it's nation and/or its Immortals (they're not mercenaries available to other nations for hire). These orders are: Order of the Immortals (composed by many traditional, heavy armoured, cuirassiers, many being Defenders); Order of the Unicorn (also cuirassiers, many humans and elves); Knights of Niedegard (again human cuirassiers, but with many dwarven crossbowmen on heavy war wagons). The other orders are mainly composed by infantrymen: the Servants of Eusdria (the largest order, its name in Eusdrian is "Launt Kjnajcht" (in Hattian, it would be Landsknecht); humans, known for their halberds [ok, this one is a departure from canon; it was originally the knights of Eusdria, honourbounds that use axes]); Company of the Wolf (lupin mercenaries from Renardy, especially before it acquire it's M-French culture; they're famous for carrying always a sword named Katzbalger, since it was usually used against their enemies rakastas); and the Company of the Bear(dwarven Landsknecht with halberds).
The last order, the Warriors of the Sea, is actually a group of privateers that works for Eusdria. It's still a small group (when compared to those working with Vilaverde, Texeiras, the Lb and Renardy), but it will, someday, allow Eusdria to also have it's place at the Western Sea.
My motivation for giving Eusdria a more modern appearance is that because RS simply can't decide about what to do with it; at the same time that it changed VotPA original idea of a M-Frankish kingdom, making it much more Viking-like, also made it clear that it was actually modernist itself quite quickly (it even have it's own fencing school, the Verdegild)!