A cheesy army I used about a year ago had 8 Regular SBW Kn(i) and proved reasonably effective. I had Regular ;DBd(i) and Ax(s) plus a bundle of Lh to bulk it out.
It was Later Judean which has 8 Thracian Reg Cv(o) which get regraded to Kn(i) as per the rules list note addendums - Like I said at the begining it was a bit cheesy.
Gordon