Have /realname be usable on vanished users. I'm pretty sure this is potentially possible, tagging @JamieSinn can confirm if not. Vanished players are able to break rules by abusing both /vanish and /nickname, making it hard for users to collect /realname evidence for complaints.
I would rather just change evidence requirements to not REQUIRE a screenshot of an /rn - still suggest it of course, but if someone doesn't have it, just have an SA or GA take a bit of time to look it up in the logs, as even with this it still leaves the possibility of not being able to use /rn because a player is on another server.