Western workplace? It shows up everywhere. Beauty tools and products are some of the most common artifacts found by archeologists. The silk road carried uncountable tons of materials for makeup, clothing, and jewelry. Do you think Mao or Lenin went around in their pajamas smelling like they haven't bathed in a year?
This isn't a western thing. It's a human thing.
Some of these issues are ones that were experienced and solved by the big IRC networks. They used different methods - nick registration and authentication via a bot, for instance.
The source for many of those is available. Why not see how others solved the problems? A brief look at the Charybdis IRCd source (at least the Freenode version) shows capabilities for limiting channel creation to authenticated users and what looks like built-in ChanServ and NickServ.
In any event, you may be worrying over nothing. I ran a friends-only IRC server back in the day and didn't have issues with impersonation. I rarely saw any unknown users and it was easy to detect them because they weren't part of my circle of friends. We had a couple bots that logged the channel and provided various services - it wouldn't be hard to have one enforce security.