To make learning and building, I bundled these into templates across multiple programming languages. Inspired by Erlang's OTP, I also built an actor supervisor system around each of the stacks to handle the process reliably.
I have a few previews for everyone to play with and provide feedback.
More importantly, are the customers of YOUR customers exclusively devs?
If the customers of your customers could include small businesses, then the stack you offer them should prob be capable of the simpler OIDC (Continue with...) instead of / or in addition to OAuth (Sign in with...) and probably Microsoft along with Google. And if the customers of your customers include middle class and up American consumers, also Continue with Apple.