You might plug it to move it around until you replace it. It looks pretty well squared off. What is the DOT date on the tire?
Riding solo, I rounded a bend into a box of cabinet staples scattered across the road. The rear tire caught several, but went down slowly enough to get to a spot to insert multiple plugs. The handling deteriorated a lot as the tire went down. Considering the riding pillion you're planning for the GT, I wouldn't risk it unless I had to.