I'd find a Star Control II-derived Hierarchy of Battle Thralls mod entertaining, but then I'm an oddball who'd be amused by low-morale Spathis (fire and flee, or just flee...), stealthy Ilwrathi, and sniping Druuge perhaps led by a renegade Dynarri (enslave mind, mind blast, ooh) acting as pretender.
I don't know if one could properly model the Yehat shields (can't mod a unit to pick any ol' spell as an innate ability, AFAIK -- Invulnerability would be appropriate). Pity.