I'd like to see the Redemptionists load up on flamers and torches, cleansing their foes with holy fire and a chainsaw couldn't hurt. The leader and champs should be fully robed with the hoods/hats, and the rest more like flagellants, eyes poked out and just crazy with some self mutilation stuff going on.
I reckon (pure speculation) that's pretty much exactly what you'll get as well