In fact, the new DE codex will eventually provide a way to play Harlies as in Gav's experimental codex.
HQ: Archon (as Greater Harlie)
Elite: Harlies, Mandrakes (as Mimes)
Troops: Wyches, Warriors
FA: Reaver Jetbikes (as Harlie jetbikes), Scourges (as DJs)
HS: Ravagers and whatnot.