No, feel free to play whichever nation you prefer. Thanks for offering, though!
Ghoul played Arco in Nations but that turned out to be a difficult position since he was the only astral nation in the game. No indies (including removal of magic sites that allow mage recruitment) meant that it would be hard to protect against Arco's risk free mindhunts and the Assimilation mod, that allows recruitment of some units from a conquered opponent's cap, meant that Arco's cap was a huge prize since it allowed recruitment of mystics. So basically Arco ended up being a huge target. But here we have normal indie and magic site settings so I don't see Arco being a target more than anyone else (and we've already got more S nations signed up than in the Nations game).