This is part of the "we need to get serious" situation. If we treated this as an existential emergency (and, it is part of the package) -- then, we might put up some heat reflectors over large swaths of ice to lower the temperature. It wouldn't take too much to artificially trap more water ice (relative to building an aircraft carrier or large dam) and thus, prevent a huge dumping of ice and freshwater melt into the sea.

Once it leaves Iceland, it's going to be a lot harder to trap all that water there again in any short period of time.

And the thing about the climate models, is most of them refer to the heat energy and time it takes to melt all this ice -- not, how much it could quickly raise sea levels if it fell off of Antarctica and into the ocean. Of course, it can take about 50 years to distribute this sea level rise -- but, it's also a point of no return.