I have a five species tank up and running right now. No B. giganteus though. It's B. rothi, B. discoidalis hybrids, B. craniifer (true morph), B. dubia, and A. tesselata.
My rothi and peppereds are still nymphs but the tank is doing really well and much reproduction is underway, lol.
I intermingle many species and so far I've never really had any issues. Once my breeders produce more offspring I'm going to keep ten or so of each non climin species I own in that tank for some real color and variation. Basically Blaberus, Blaptica, Archimandrita, and Eublaberus genus, but maybe I'll find something else to add later, who knows.