Is there a way to "hide" emails when subjects are nominating evaluators?

We've been running 360s on our platform for nearly 10 years, so we have over 40,000 contacts in our directory. We just recently had someone raise concerns about the fact that emails are so accessible when nominating someone from the directory. For example, if you enter the name "Michael," the first and last names and emails for ~30 Michaels show up. I don't think this has been an issue thus far, but theoretically, someone could "mine" this information. Is there any way to make this less accessible while still allowing people to nominate from within the directory? One way might be to make it so that you have to enter an email to select from within the directory...

If there aren't any current solutions to this, I'll submit it as a product idea.