While I absolutely agree that having our MC and future wife getting on with the dominating would be fun and interesting to read, I'm not sure I'd call those royals dickwads. I mean, they're self-centred and mainly focused on their own power, whether their own or their own blood's, but Aura isn't much different (the main difference is that she has MC to infuse a bit of his own morality and ideas into her). And they're certainly not nearly as bad as 99% of manga royal antagonists and villains. They have their own understandable motives that aren't malicious, and instead aim to make themselves and their kingdoms stronger while trying to maintain decent relations nationally and internationally.