I'm not too fussed about Athena implementation, but it probably wouldn't hurt for it to be more focussed as the dirty underhanded tricks box of Zero K.
Lose the ability to build Bandit, Halberd, Moderator, Recluse, Blitz, Knight, Impaler and Aspis. Gain Snitch, Imp and Limpet. Hurrah! One stop shop for asymmetric warfare.
I'm in two minds about whether Athena should keep the ability to build conjurer. On the one hand, the theoretical possibility of coming back from annihilation might seem compelling. On the other hand, spending 120 metal to build anything you like kind of goes against the principle of being focussed on a specific niche.