Kingdom of Westen
The isle of Westen (pronounced Wess-En) was for a long time a turbulent place. After the Norse managed to achieve hegemony over the island in the mid 11th century it was the scene of a rather prolonged religious conflict as the inhabitants refused to convert to Christianity, preferring the old religions instead. It was during this time the first recorded usage of the Valknut as a symbol of Westen took place.
Eventually the traditionalists were defeated and Christianity was brought to the island, which was now under firm Danish rule. Throughout the centuries ownership of the island was transferred back and forth between Denmark and Norway, and even Sweden held it for a brief period of time in the 17th century.
And the 1730s a British naval expedition was launched to deprive the Danish of use of the island as a base of operations. It was even more successful than intended and rather than a simple blockade as intended the expedition turned into an invasion when it was realised that the island was severely bereft of contemporary land fortifications.
The British were awarded the island in the treaty of Oldenburg, which saw the end of the Continental Wars of the 1730s and 40s. Their rule would last until 1846 when it was proclaimed an independent state under British protection. This first kingdom period would last until the National Wars of the 1890s when German and Scandinavian efforts to cause a rebellion saw fruition.
This saw the period of the republic of Westen, a short lived state that lasted but eleven years until it fell apart after food riots in the capital of Korpaførstning. A provisional government was set up and the country was restored as part of the British crown and commonwealth once again. This lasted seven years until civil war broke out during the middle of the Power Wars of the early 20th century. The island was used essentially as a training ground by the great powers of the continent, acting through proxies to gain valuable insight in fighting wars in the rough kind of terrain offered by the island.
Eventually the Scandinavian backed nationalist faction won the war. At firs the new government pursued an aggressive policy of cultural reformation, wiping out anything they viewed as foreign in their culture and language, and in particular removing any and all British influence that had become spread over the years. English was removed as an official language, and the new reformed Wessish language (originally very similar to the Norwegian dialect of Scandinavian, but returned to a more archaic and distinct state by the reforms) was the only allowed one until the late 1940s when gradual reform re-legalised the usage of the threatened Wessish English dialect as a minority language, and recognised Wessish English as a minority cultural group.
At around the same time the military junta that had been in charge dissolved and after a referendum it was decided that the new Wessish state would be a constitutional monarchy. The royal family was imported from Scandinavia, and a new flag was chosen by the king: a simple white with a black border and a black Valknut, which stood in contrast to the black and blue Nordic cross on a white background that had been in use since the republican era. This was deliberate, as it was seen as important that Westen set itself apart from Scandinavia to emphasise its own unique blend of Nordic and British cultural traditions.
(Just something I hastily threw together. I am aware that the demonym has irregular spelling: it's intentional. That's how they do it in this timeline. It's scenario A, I should specify.)