Well a Century is a Star, and a Tank Maniple is also a Star-ish, same for a Wing, 5 Air Maniples aka a Star!
Now they might have a problem with the Infantry, BA is a Contubernium, but the others would be more like double Points...
So a Cohort is close to 2 Trinary - 3 Binary Mech, Reinforced Star of BA, 3 Stars of Tanks - Aero, about 5 Stars of PBi or so...
TT