The plan is to leave the Dome roof intact and inflated while building the new roof over and around it. Based on the plan, cranes inside the Dome would have no access to the new roof.
Now it might be possible to deflate the Dome, remove the center panel, and then bring a crane in to work through that opening. But when you deflate and intentionally remove one or more panels, you run a the risk that the wind gets into the hole and causes damage. That is how these inflated domes usually suffer catastrophic failure. Just one panel gets damaged in a minor way, then the wind gets into the opening and rips a number of other panels.
This approach would be dangerous but might be manageable with a pre-built temporary cover over the missing panel that would still allow the crane to operate and the operator to see.
I think they are going to have to think outside of the box like this to get this project done and not lose any games for basketball and football.