I was not advocating that the factions become expert in using foreign fighting styles. To the contrary, actually. Some generic mercenary type units could be shared amongst all factions unfamiliar with their fighting styles. In BI, the Eastern Roman cataphracts were effective yet still quite inferior to those of the Sassanids. Knockoffs.

Hell, this building of which I speak could just be a sort of mercenary meetingplace/recruitment network with small pools of the relevant unit types, and each upgrade to this complex would improve both the numbers of units and the replenishment speed. Is this more feasible?

Oh, and eddy, use uppercase letters on occasion and regular font width. It'll make things easier for people to read.