Where do you want the noise? To the front, sides or everywhere. The Noveske pig does a good job at mitigating noise to the rear and sides but seems to magnify it out the front. IIRC the old Clark muzzle brakes from the '80s were loud as fucking hell but did a good job at decreasing muzzle rise.
I'd try and find one of the old school muzzle brakes, before they had all this shit figured out. Most of these were concerned with muzzle rise and not noise. The newer ones seemed to have both factors mitigated to some extent. The BL is that your's is a unique and strange request. I don't think anyone has purposefully designed one to increase noise....that whole liability thing.
Edit:
This! I have an AAC breakout on a 556 SBR that will make your ears bleed!
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I had forgotten about these! Yes, these seemed specifically designed to hurt your ears. I occasionally use one on my 7.5 and it's painful with double ears on. It makes my nose bleed! I actually stopped using this without a can because of the noise and rotate in a flaming pig when I shoot sans can.