While I have gone for Royal names that are as historical for Sweden, I realised just quite recently that the historical Swedish royals do not fit neatly into my timeline. As a result, I am changing some things.
I have decided that Gustav V, present king of Nordmark, is born several decades later than Gustav V, king of Sweden, historically was. He is therefore born, in WesWorld, in 1881, was married in 1906 to HR&IH Princess Victoria of the South African Empire, and ascended the throne in 1907. They still have no children (there was a still-birth in 1914), and the present Heir Presumptive is the 26 year old brother of the King, HRH Prince Carl Phillip. The succession to the throne is by principle of male primogeniture - male heirs within a subset are always preferred to female heirs within same subset.