Not even. King of diy still had aggression problems with his aros in his 2000. I wouldn't keep full grown dovii or umbees with anything periodI think it could be done, but to effectively mitigate their extreme territorial aggressiveness, you would need an enormous tank or pond in excess of 1,000 gallons. This is out of reach of most cichlid enthusiasts.
It does not workyou are right mosr dont have an aquarium that big and it would be risky but could you imagine a 20 plus inch dovii and 20 plus inch umbee getting along just want to see who has experince with this and it actually worked with no problems hope to see somebody who has and hopefully the would post pictures