Have we considered using OOC accounts?

I'm not sure how Relic Lore does it, but I believe it's custom development. When I first created Wolf, I looked for a plugin that would do something similar to what you're describing, and the account switcher was the closest that I could find. I also don't know how exactly theirs works/it's been a long time since I had an active account there, but I'm pretty sure you still register for each individual character...?

I don't believe RL shares their code at all (which is fine!), so the developers here would need to write something custom to create similar functionality. Not to mention the migration of existing IC accounts to become "sub"-accounts of the new OOC accounts would be a lot of work. :x

tl;dr: I don't think it's worth it at all when the system we currently have is fine! Similar to Chels, I drop characters from my list that are no longer active in the game.