Unfortunately there is no equivalent of the Photon/P1 Device Setup SDK for the Argon at this time, and as such it will be difficult to set up Wi-Fi for an Argon used in a product where you want a white-label setup experience.
The Android and iOS Particle apps are open source, but not exactly easy to adapt for use in custom mobile apps. There is no schedule for releasing an Argon setup library at this time.