Allowing users to use custom alias in Teams meetings

In our company, customer support agents occasionally jump on calls with clients.

But many of our agents aren't comfortable with disclosing their full names to the customers, so in Zoom we set their display name to their first name and the initial of their surname.

This isn't something that's possible in Teams (unless we change their AD display name and email address).

Is anybody else in the same situation?

The only two ways I can think of getting around this:

1. Using a shared account, but this would only be an option for us if it were possible to delegate access to it in the same way as we can delegate access in Exchange - i.e. allow the user to access this shared account via their own account. Letting everyone actually log into a shared account is not an option due to security risks and auditing nightmares.
2. buying a second Teams license for everyone for this purpose, with the "anonymised" display name. But managing this would be a pain, both for us and the users.

Neither of these seem like particularly good options. Any other ideas?

As much as we'd like to fully move away from Zoom, this is one feature that we genuinely use that Teams doesn't have.