Hahah! I'm a sucker for a challenge.
I put all my non-mated Creos in with my Idolos to (A) eat off all the extra flies, ( B) save shelf space for more Idolo cages and © prove that Idolos wouldn't attack the creo females, since it was unlikely they'd flap their wings (males on the other hand DO make decent Idolo feeders - take the air and kiss it good bye!). I was pretty sure I didn't need to worry about them taking out an adult Idolo. Iiiiiiiiiiiiiii know better noooooooow.....!
I've done similar "stunts" for years. Gongy's and Ghosts and Boxers all peacefully co-existed without incident (or significant incident). Hetercheros (sp?) and Brunners did fairly well with the Idolos, but menaced anything smaller (or, with brunners, other brunners - they are SO not communal). I even had adult female Orchids in with the Idolos - without friendly fire.
Even local boys (stagmantis?) in with the big ladies. On that front, there were... ahem... the odd incidents....
Two Notes:
One, this is an old photo. The screen at the top in ALL my enclosures has been enhanced with mesh. Screen breaks tarsus. It's weird for me to even look at this photo now.
Two, almost all the local boys mounted the Gongys' (about 6 or 7 that year). But, the ladies won in the end. When the boys fluttered their wings, or dared to fly, they got CHOMPED!!! Every one of them ended up as scraps in the bottom of the cage!