It may be worth getting a whfb box or two for some variant bits.
Empire militia will give you spare swords, clubs, axes, daggers, etc. as well as some gang looking clobber (trench coats, heavy gloves, a few spare heads and so on).
The Flagellants box will be good to give you a more crazy/cult look, suitable especially for redemptionists, but also Cawdor. The wood elf plastics could provide interesting pieces for Cawdor too (hooded heads). The Bretonnian men at arms box could provide good bodies.
The Chaos marauder box has some good head variants for a few gangs and gives you that muscle bound thug look that would suit goliath gangs.
I think the best results would be mixing some whfb kits with the cadians or catachans. Catachans probably fit better with the militia/marauder boxes.
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