Use the authjs.dev library to implement SSO for user management. This will automatically give the ability to use any login protocol any user could ever want.
I have numerous self hosted apps with multiple users, running them all through authentik is very important for users that are doing something similar.
Every homelabber will have a slightly different setup but the above library will essentially just support everything right away.
You will never need to worry about users requesting whatever protocol they are using because if you check the list of providers it’s basically everything.