Here are some proposals for the civs that were left over. I'm not particularly attached to any of these, so new ideas are always welcome. At least now each Civ has something.
portugal: organ gun
nubia: camel mounted unit (from any era)
ethiopia: a rifleman or infantry that can reflect their victory over the italians perhaps?
mali: skirmisher (could use a new name)
swahili: “majeshi” is swahili for armed forces. Traditionally the military powers in the region were warlords, followed by Arab, Portuguese and English regimes. The modern African States in the region became independent in the 1960s
kongo: throwing knives were a traditional weapon of tbe Bushingo, maybe that can be incorporated somehow
zulu: another impi-espe melee unit
amurru: The bulk of their army was unarmored spear men maybe they can have very cheap spearmen
assyria: ideas here:
http://www.academia.edu/768283/Some_Basic_Tactics_of_Neo-Assyrian_Warfare_2_Siege-Battles
hatti: Meshedi these were the elite infantry that made up the core of the hittite standing army
kushan: seems like they relied on mixed cavalry chariots elephants and horsemen and archers, so any pre-gunpowder mounted unit will work
tibet: dob-dob (warrior monks)
tamil: Velaikkarar: chola military caste from the 9th and 10th century
siam: amazon guard Mongkut’s personal guard (in fact all of the occupants of his palace) were women
angkor: Phak’ak (spearman replacement)
polynesia: maori warrior