That would be cool, not gonna lie, but...
The current situation is less "We inexplicably got free, let's release the others," and more "The exhibition puefes are providing an adequate distraction. Let's bail!"
I would love to pick up stuff from Trazyn. He's already going to try and recapture his missing museum piece, since a female Primarch is as unique as it gets. There's not much point in not trying to rob him and get a head start. Issue is whether we will have the time opportunity to do so.
It's probably for the best to just take this opportunity and bail out. There's not a lot that can stop a Primarch, nevermind Kurze, who's hellbent on escaping. Best case we will take along some stuff as we make our escape. A weapon here, an artifact there... a bag would be nice.
I have absolutely no clue how we are going to get off of Solemnace though. The planet is essentially a gigantic prison/fortress and Trazyn controls all the levers to decide what comes in and out.