Search for "backdating heat" to see a lightweight way to remove the rear blower while keeping some warmth and windshield de-fog.
If the heat doesnt work today, removing the rear blower will not impact anything you describe (ventilation, defogging). The fresh air flow comes from the front of the car. I removed all AC componants, rear blower, but installed new heater flapper boxes and backdated the hot air flow off the engine. This gives me the heat needed for comfort and defog in spring/fall.
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