There's a number of changes that I want to make to Valenar, but in the end, I'm not sure that it matters too much. Valenar is clearly a bit of an afterthought in the campaign setting; the section on it is very small, and it is not presented as a place where adventurers would find much to do, nor is much description given of anything to do.
The obvious change, of course, is that I don't have elves, so seraphim take their place. I'm also not quite sure what warbands do when they're not at war, when it goes to great pains to point out that most of the agriculture and other requirements to support society are actually done by the ethnic Cyrans who were there before the Valenar elves arrived anyway. Do they just gallop all around their country hoping against hope to find out that they've been invaded by someone so they can fight? I think it much more likely that the Cyrans are settled farmers and the seraphim are pastoral nomads, living out of camps or wagons like the Scythians, the Mongols or the Plains Indians, herding vast herds of cattle and horses, and interacting with the settled farms in a manner that's half trade and half bullying/banditry.
I greatly dislike the name of King Vadallia, because it sounds like a Georgia sweet onion to me. Taking the -ia off the end of it makes it OK, although still not a great name. And the warbands are not sex-equalitarians. In real life, the only time women are warriors are when a society is so pressed into an apocryphal, end-times situation that it is willing to literally mortgage its future on the outcome of a battle. Or, if like today, society is so delusional and decadent that it can't really imagine the future and believes in the acid-dropping nonsense of physical sexual equality. So, the Valenar warbands are, of course, male only, as warbands have always been across every culture ever in the history of the entire world.
Other than that, of course, the book doesn't give you a lot to work with with regards to Valenar, and I get the distinct impression that although it's mentioned, it wasn't ever really intended that PCs do much in Valenar, and in order to do so, you'd have to do a lot of development work on your own since nothing much is presented. That will remain true in the remixed version, since I'm not going to put much work into developing anything either.
Valenar population remixed:
Humans: 55%
Seraphim: 35%
Goblins: 4%
Orcs: 2%
Other: 4%