OK, I’m having a hard time visualizing what is going on here.
I don’t like working bees at night because they crawl and you can end up with a mess. However if it is cold and they are in a cluster, they’re probably not going to crawl. But would I want to break up a cluster making heat on a cold night, probably not a good idea. You could likely end up breaking the cluster and it might be too cold for them to re-cluster.
I would only try to move a cluster at night if a cold rain was expected. They can survive the cold, but if they get rained on they’re toast. I can’t really visualize your setup, so this rain scenario may not apply.
Yeah....I would wait for today :)