Perhaps something else to think about - though the new mercenaries rules prevent us from getting a Terrorgheist that way, we should be able to use crypt flayers who have a similar shooting attack as the tomb banshee.
Granted, most of our stuff will already be decently fast unless we take skeleton battleline, but I can see them having a place as harrassers who can add even more mortal wound output to our bravery attack army.