In case you or others find it interesting, I've had luck removing an authentication SPOF¹ by using IndieAuth on my personal site². I wish it were an option on more of the sites where I need to sign in.

¹ https://twitter.com/dmitshur/status/1223304521767669761

² https://github.com/shurcooL/home/commit/bb504a4ef0d7c552d363...