Multi site one set of accounts

I’m aware of the basic concepts of using multi site setup.

I have two websites, separate accounts on the same server, so each have a www/ folder.

Is it possible to have two set ups of Kirby, but share the user account. So if you register one site, you’re registered on the other and vice versa. And you can control and edit accounts for both sites.

It’s a little gangster, but depending on the way the file system is laid out out, you can create symlinks with PHP. Therefore, you could probably use a kirby hook to symlink the user account over to the other site. I guess you could potentially run into permissions issues, but give it a shot.