A discord bot you can be.
Invite the bot to your server; it requires the "Send Messages" and "Manage Webhooks" permissions.
Put
[groupoid: <name 1>=<key 1>; <name 2>=<key 2>]
somewhere in the channel topic and invoke !refresh
via DM with the bot.
Now anyone can use !inhabit <key 1>
to be <name 1>
and so on.