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If the return in the room is not ducted to the plenum for the HVAC unit, but just returns air to the general area near the actual return duct, then you can probably just block that return. Air will still exit the room, assuming the door has the proper clearance on the bottom and will make it's way through the house back to the unit. That might cut down the volume enough to make it more habitable in the room. If not, smaller grill.... or anything that reduces the airflow to that room.
You could also fix it by opening a window in the room, some of the time...
JR
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