The sets that would provide suitable troops for this war are;

Orion Iberian Infantry

HaT Spanish Cavalry

HaT Hannibal's Cathaginians - Spanish Infantry

Hat Carthaginian Allies (only two Iberians)

Odemars Iberian Infantry (the quality of this set seems pretty low)

In a pinch you could probably use some Celts as well.

If only HaT would bring out their 1/32 Celtiberians in 1/72...