Silver Hawk Irregulars, those that hail from Callison and Marcus, use a half-purple/half-silver scheme (left/right split). They exist from the 3SW (2966) through 3081...but then were reformed 3135. So they should just squeeze into contention by a nose.
They have Martha Zuritas from the 4SW through Guerrero, and access to many other paint schemes. Besides, purple and silver is a pretty snazzy look. The Gryphons, under Zuritas, acquitted themselves well against Snord's Irregulars (in 3029) and were a key reason for the LCAF's faltering offensive into the Combine during 3039 (see Field Manual: Free Worlds League, FASA 1699, pp. 88-90 and Rhonda's Irregulars, FASA 1643, pp. 8, 40-41).
Hmm...Zurita's Company is easy enough to assemble from models on hand. I might take a stab at the unit myself. Might be worth a thought for you, Wierdo.