I believe somewhere at some point it was stated no new head/frames for our automatons, but since I can't find that post... I'm putting out there a possibility to add:
A Head / Frame based on a support only job, such as bard or corsair.
Elemental capacity already dictates spell types, so this isn't far from being able to associate maneuvers with a song or roll effect that would have an impact on the entire party... please consider this...
thanks!