A behaviorist worth his weight will be able to handle the situation. They're experienced with aggressive dogs and know the risk. So bringing one in is not necessarily putting them at grave risk. It really does sound like you need an outside objective opinion by someone who can see in person what signals your dog is giving. A behaviorist is going to be your best bet.
Any internet advice you get will be hodgepodge because we can't see your dog's body posture or reaction to strangers or other environmental stressors--and you run the risk of making him worse if you misinterpret something that's going on. This is really too complex and dangerous a problem to try to tackle on your own.
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