So with the choice made, I place Gamer's Grass of 'strong green' shade. Polybian Romans II/33 on the 3.0 edition have:
1 x General (Cv)
1 x equite (Cv)
4 x hastati/principes (Bd)
2 x triarii (Sp)
2 x velites (Ps), and
a choice of 2 x either hastati/principes (Bd) or allies (3/4Ax)
By adding the command/colour party minis I've ended up with a full-roman option. I will still be creating some allies for them!