I read this article already on how to force real names instead of usernames in post headers. However, I’d like to at least have the option if not the forced requirement that users’ real names be used for mentions in posts. Is that possible?
I dont think this is possible but you can make a custom user field and make that one required.
I’ll just leave it alone then. My users are having a hard enough time adopting. Generational challenges 
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I’m not sure how a custom field would work here?
But there is this theme component which may do what you need:
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DIdent know that exists. And I forgot how you cant ping people based on a custom field lol