Since I started the thread, it's probably obvious that I'm not aware of any conventions, hah. However, reading through your use case, I wonder if "Approval Group" might actually work**.

Whether or not there are any default workflows in place for Approval Group, it's probably best to reserve that field for whatever group would/might be reviewing and approving changes to the CI. In this case, would your externally responsible team be the best team to potentially review and approve changes?

**Of course, you could always create a custom group field, but that recommendation would violate the original question in this thread!