Question Is there a way to transfer player data to another nickname?

Hi everyone!

I was wondering if there is an effective way to transfer data from a nickname to another. I know a lot of plugins rely on Essentials' user map, so I'd like to start with that.

The problem: my friends and I have been playing using TLauncher, but some of them finally got their hands on an original copy, and I want to move the server over. The thing is, we have different usernames, and I really don't want to lose all of our stuff.

Has anyone had to do this before?

Thanks.