Ah yes, that wonderful lore of trying to kill you every time they meet you, wanting to wipe out humans if Ymiron had his way. The Valajar are literally the first Vrykul you encounter that don't want to instantly murder you and even then they serve Odyn who doesn't give a rats ass about faction conflict, he probably encourages it. They have zero reason to join either faction, your fetish doesn't change that.
The Kul'tirans aren't just some " human " model, they can't be copy pasted and judging from wowhead model viewer they have their own animations and it's not fully complete yet, you don't know what the future holds so comments such as " "What if's" don't mean shit! " doesn't hold water. If they receive no better customisation by the time the beta ends then I'd gladly take up arms with you, until then we have to wait and see.
Sitting here screeching VRYKUL doesn't improve anything, it doesn't give the kul'tirans better customisation or get you any closer to it, be the feedback you want, go to warcraftdevs on twitter, make posts on the EU and US forums, drum up interest in making the changes you want to see, sitting here ranting and raving won't accomplish anything.