im not sure this is in the right place so feel free to move it if im in the wrong place.
2 questions:
1. can i keep african praying mantids with indian stick insects without them getting munched? and are the living conditions the same because stick insects can survive in my bedroom so they should survive in wierd conditions.

2. can i keep locusts, roaches and crickets in a community?

Q.2 awnser- yes. dunno about the mantid thing though. they might attack each other.

Mantids eat each other, I doubt they will be hostile to any other animal.

Mantids and anything else - No
Crickets will eat anything including baby roaches, locusts I think are purely herbivores but I could be wrong.

I think neither will work -- mantids aren't just cannibalistic, they're general predators.

As stated, a cricket will eat anything if it's recently molted. I'm not even sure locusts require the same conditions.