This week, I suggested to them that I set a timer for about 10 minutes. That's their time to quietly chat and socialize while they follow the lunch and unpacking procedures. Once the timer goes off, it's time to get to work - non-negotiable.
So far, they like it. As long as they are relatively quiet, they don't hear from me for that 10 minutes. They seem more amenable to settling down at the beeper.
We'll see how it works in the coming weeks. Do you have a routine like this? Do you have another way of balancing chat time/work time? Let's hear about it!