custom slugs for author archives for each different role

Currently, my wordpress is configured to display author archives (using authors.php) at the following url:

site/users/[username]

I would like to be able to have different slugs for each of the different roles. E.g.

site/subscribers/[username]
site/contributors/[username]
site/authors/[username]
site/editors/[username]
site/admins/[username]

…and so on. I know how to create the page templates for each, but I just don’t know how to make the permalinks work this way, or how to dynamically compile the URI for each link to an authors.php page in the template.

Any advice?