Of course it could, but why do it on Zulip if Nostr exists? Now you depend on a Zulip server and all its complicated APIs that some other company controls.

If you use Nostr groups it's pretty much set in stone and you can just augment it, while at the same time using other tools that already exist for Nostr if you need.

And the agents identity part is just easier with Nostr, no need to create fake emails for the agents, create a separate bot admin dashboard and so on.

Not to mention that once you have a global identity layer it becomes easier to get people from outside the company to join temporarily (just a use case that came to my mind).