I have no experience w/poling an AS, but do w/other hulls. I can confirm the 170 hull will not drift inline w/tide...it has no keel. So the hull spins perpendicular to tide, and can even spin 180° on axis w/strong tide.
Essential, it will be a pain to pole cause every push you make the transom will kick out to the opposite side. The hull wasn't designed for poling, drift fishing, etc. But considering you stated mounting the platform for the primary purpose of vantage and sitting, why not install a half tower?