I'm not saying you did not acknowledge this at any point, however, since anubis88's comment on your army composition you posted twice defending your choice and on both occasions you said nothing about Triarii/Pedites but explained your use of local skirmishers, on which, I think, no one commented.
I doubt anyone's challenging Romans used local troops on their campaigns, but this is what you defended in your posts following your description of our army composition.
In my opinion it would make sense that the core of the army would remain the same, imho. Roman army was quite flexible as the legions would/could be complimented with auxiliaries and with these auxiliary units you can support the heavy infantry core according to its needs. Crassus failed to do this, and we all know how he managed at Carrhae.
However, I would think it to be rather ahistorical to fundamentally change the legionary core of the armies to better suit the opponents, especially in Camillan/Polybian times. It's a game, though, and it may be played as one wishes.
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