meet.google.com but is often overlooked or misunderstood. That feature is the option to give your meeting a nickname.
Using a meeting nickname in G Suite for Education is an excellent alternative to displaying and using the Google Meet link that is assigned to your Google Classroom. You can choose a nickname in advance and tell your students what that nickname is, but they can't join your meeting until you start the meeting. You can re-use your nickname for multiple meetings.
In the following video I demonstrate and explain how to use nicknames in Google Meet and why you might want to try using them yourself.
On a related note, here's how to use grid view in Google Meet.