What is the best way to re-install a SQL Server that was installed using a wrong language without losing any configuration?

* Should I install a second instance parallel to the default instance - here I do not know if this is anyhow possible at all if using a different language?
* Or should I install a second installation of Sql Server (as if it were two different Versions)?
* Alternatively I could of course uninstall the old and install a new Sql Server using the correct language.

Independent of the way to go, as you can imagine, I definitely want to avoid doing all the maintenance work for creation of Logins, Users, Permissions, Alerts, Operators, Jobs etc. again. Is there a good approach to achieve this?