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CK2 units differentiation doesn't work like that; there's early, mid (default), and late. The dates at which this happen can be modded, but default dates are 950 between early and mid, and 1200 between mid and late.
Manic's units have an assortment of early, mid and late units for many cultures, but I don't know if it's fully compatible with HIP
 
One thing that has been bugging me for ages is that the nomads like Altaics start with Iranic unit stripes :( Anyone know how I can edit that?

Also I remember a while back I played as Anglo-Saxon and by 13th century I still had the early era unit stripes.