"Imitation legionaries" and other questions

[Visitor13]

Vanilla RTW had "imitation legionaries" available for Numidia, the Seleucids, Armenia and Egypt, I think. Basically copies of Marian legionaries with lower stats. What is the historical basis for these units, if any such basis exists at all?

A related question - if not the "imitation legionaries", what would a Numidian kingdom use for assault troops (surely something else/more than Garamantines...) and what would its spearmen look like? How (in)accurate is the generic, wicker-shield-toting, veiled desert spearman in the context of Numidians, the Maure and other North African tribes of the EB era? The robes would be the most dodgy thing about them, I guess...

Note that this is not a veiled demand for any of these units to be included in a future EB version.