Hi Lord Hatham, As I understand it, it is certainly allowed mechanically, though the responses of other players/NPCs to your actions may tend towards certain norms.
From your perspective, yes you haven't "taken sides", but from their perspective, they may interpret your actions as having taken a certain political or social stance. You can certainly build a community in which you try to build a certain culture, but how others see that culture is based upon their own worldviews.
Typically communities are more acceptive of things that fit their cultural norms. If people act in ways that approach the fringes of those norms, it becomes less and less likely that they will accept it.
I suppose it really depends on how exactly you'd like to build your "tribe". If it isn't too far from social norms, then it may be considered "eccentric" or "strange", but not threatening to their way of life, or a nuisance. NPCs are much easier to predict than players in that way, as they have a prescribed set of rules they follow - though I would hope CoE is complex enough to have quite individualized NPC personalities.
Keep in mind, you may have access to tribes that already operate as you'd like. The Erishe, who won't be discovered at launch, are a nomadic people who live in the drier climates and travel in caravans.
Anyway, I wish you luck in your venture. It sounds fun and I'm sure you'll find a way to bring it about in CoE.