While cool, I think Lion Rangers are a little one dimensional atm. I can easily see them getting refolded back into a unified aelve faction. While you could try to finagle a battletome out of them, I think thats almost like trying to make a battletome out of Maneaters. Then again I did really like someone's suneater fan army (thats basically expanding the fire eater ogor, a single model!).
Maybe since White Lions are far more about brute strength, maybe their ranged unit should use throwing axes rather than bows? Perhaps white lioness riders that trade power for speed?
As for warscrolls that look like official ones, theres this website.
https://runebrush.pa-sy.com//warscroll/