I guess from all the foregoing, the smart way to go is to find "near matches" for the types of troops (weapons, armor, etc.), and just "borrow" their statistics! From what I know of "Hail Caesar!" (I am still learning the rules!), the biggest "headache" will be to try to decide if the Shang should be organized in what I'll call "regular units" (i.e. two-deep lines), or as "war bands" in much BIGGER "units" (four-deep lines)? I'm inclined for the Shang towards two-deep lines, and to make their "barbarian" opponents four-deep "war bands."
Thus, I think I will make the Shang "king's" own "Royal Guard:"
Heavy infantry armed with ji spears & long daggers, Clash 7, Sustain 7, Short Ranged 3, Long 0, Morale 4+, Stamina 6, counts as "Drilled," and cost 29 per unit.
Depending on how they are equipped (sculpted), the King's own clan, or a Duke's or a Clan Chef's "Clan Warriors" would be:
Medium infantry armed with ji spears and daggers, 6, 6, 3, 0, 5+, 6, "Drilled," @ 26 per unit,
OR,
Light infantry with spears and/or javelins, 5, 5, 3, 0, 6+, 6, NOT "drilled" being "lesser sorts," and @ 20 per unit.
Maybe make an option for the Mediums to ALSO not be "drilled?" Or only allow a percentage of all the infantry to be "drilled?"
Also, borrowing from the Qin list in "HC!" I might add an option (if I can discern that the Shang also had a sort of semi-organized militia system?), for a reduction for any units made up of "peasants," to make them "Light Infantry" and also "undrilled impressed troops." Then make a further reduction of the "LI," if a levee en masse, and especially at planting or harvest season, to "add" (subtract really) to the "undilled impressed" w/ the application of the special rule as "Levy."
Probably the simplest way to go I guess -- rather than trying to work out some complicated "algebra" or WORSE, "calculus!" to convert from the old WAB statistics! Still have to sort out chariots and also "barbarians," but I think this may get the job done! Thanks to everyone for their comments!