Cladding systems are proprietary and not interchangeable or (for the most part) off-the-shelf. Some amount of the Integro cladding was on site, and a large quantity of it was stored off-site in a yard, but I don't believe the entire job had been fabricated at the time of the bankruptcy. And even if it had been fabricated, Westbank would be gambling to use it, given that the literally only company on earth that could have provided parts and materials no longer exists.
Then you have the installation problem. This was always going to be a bastard job to install, and the Integro system had serious issues during testing. No installer wants to be on the hook to deal with it. I wouldn't touch it. It's a black hole. Someone's going to go bankrupt (again) on it.
And then there was a design issue. This never should have been curtainwall in the first place. This job so obviously should have been specced as windowwall that it's almost absurd that it ended up as curtainwall. Put the glass blocks in a windowwall frame and call it a day. But here we are...