The Elves very much show that they identify not just as Forsaken but still together / apart. There is no indication BE’s wouldn’t accept them, as the Dark Rangers in Orgrimmar are also allowed to stay for the Horde, why would a member of the Horde not be accepted by another member when has that ever been the case in gameplay or lore in WoWs life? Void Elves you wouldn’t have guess would be on the light loving faction yet there they are.
It is a much desired request among BE fans, and I just feel its mean spirited to gate keep that. We have HE fans out here arguing for VE paladins and the like, let BE fans have a win.