Not sure duct tape would stand up to constant contact with water/detergent. Seems like the better solution would be a heavy nylon zip-up carboy jacket. If the glass exploded, it would be contained and the jacket could be de-glassed and washed.
For sure! I love the ease of cleaning/sanitation and the observation of fermentation that my glass allows. I picked up some heavy nylon covers to protect me/my stuff from when I get clumsy or decide to make a bomb. They're also great for shielding from the sun and general handling of the carboys.