The current plan suggest that Heady Artifice will make the automaton use a different 2hr depending on the head used. Given the less then enthousiastic responses to that idea, I would suggest the following:
The automaton equipment window gets a new slot, reserved exclusively for 2hr abilities.
Selecting this slot will show a number of possible abilities for the automaton to use.
Some are available to all frames, others only to some frames.
Two-hour abilities:
Mighty Strikes (Harlequin, Sharpshot, Valoredge)
Invincible
Eagle Eye Shot (Sharpshot)
Manafont (Harlequin, Stormwaker)
Chainspell (Harlequin, Stormwaker)
Benediction (Harlequin, Stormwaker)
Additional 2hr abilities:
Blood Weapon (Valoredge)
Meikyo Shisui (Harlequin, Sharpshot, Valoredge)
Hundred Fists (Harlequin)
Perfect Dodge