Common wisdom is that Bloodbrides aren't really worth it over just regular old Wyches. They're too expensive and just not durable enough. Accordingly, I've never seen them fielded nor heard of good strategies for them that aren't the exact same as Wych strategies (charge and tarpit tough guys and/or cut up light infantry).
Honestly, I'd recommend just taking more of the regular Wyches. The special weapons Bloodbrides have access to and the bonus stat aren't really worth it.