Another option I was thinking of was adding two Autarchs with Reaper Launchers to a squad of 5 Harlies with a Shadow Seer (Veil of Tears).
On each turn that gives you 4 BS6 S5 AP3 shots, and the unit can't be targeted over 24", (more likely, 14"
. And if they get close, good in hand to hand too. I sure this is expensive however ( think around 300 points).
Mez