Foot command element?

This is a probable for my Poly Roms. I'd quite like to feature a command type element, to sit amongst the Hastati. I have a mini from the Esci Impy Romps (centre), two from the HaT catapult plus box (top row), and I also have a potential head-swap from a damaged Hastatus to an Italian Ally mini (bottom row)which is otherwise close to the Roman Officer figure from Armies of the Macedonian and Punic Wars.