I’ve just been playing around with that very idea. But I can’t get any other collision capsules to trigger consistently when another character hits it.
Around 10% of the time the capsule will block the other character and the rest of the time it acts as though it isn’t there at all. 
From what I’ve read this is due to the way the CharacterPawn handles collision while moving. It seems to ignore its other collision volumes during its sweep from a to b.
Though why it still seems to work 10% of the time I have no idea. I still have hope this will work with CharacterPawn but I’m pretty lost 