Actually, the more I think on it it, the more it makes sense to use Shadowheart in this way, to at least introduce the in-game feature.
It would make narrative sense, because of Class and trickery deception bent, and because the PC might be encouraged to disguise their appearance by changing it, whether in subtle ways or major ways at various points throughout the game.
I'd like to see a feature like that introduced into the EA at this point, just to keep it engaging. Indulge the PCs in a little narcissism entertainment, since you know everyone likes to swing the cam around or watch their choices play out in the cinema view. Since Shadowheart is now on the Nautiloid, and still the first Companion we meet on the beach, she would be a good one to introduce the Hair change option.
She already has what, like 3 or 4 different styles in the Head's/Hair mod? It would make sense for her as well, to lean into the PC about their appearance being "too predictable" hehe.
