I think you might need to recalibrate your idea of the scale of this object. The iceberg weighs about a trillion (10^12) tons. For comparison, a Nimitz-class aircraft carrier is about a hundred thousand (10^5) tons. So you're talking about moving an object which weighs about a million times as much as the whole US Navy carrier fleet.
Then, once you had it back into position, you'd need to apply your "glue" to the whole crack surface, which is around 40 square kilometers, a little smaller than Manhattan Island. Also, the majority of that crack surface is hundreds of meters deep in sub-zero waters in one of the most inaccessible places on the planet.
Then, once you've done that, the same forces which caused this bit to calve off would cause a new bit to calve a year or two later.
Then, once you had it back into position, you'd need to apply your "glue" to the whole crack surface, which is around 40 square kilometers, a little smaller than Manhattan Island. Also, the majority of that crack surface is hundreds of meters deep in sub-zero waters in one of the most inaccessible places on the planet.
Then, once you've done that, the same forces which caused this bit to calve off would cause a new bit to calve a year or two later.