>>mathia+(OP)
As one who self-hosts a number of Open Source applications for a small group of family and friends, I would love to have a simple SSO proxy solution. Many "open core" applications don't include SSO in their Open Source offerings, thus locking small non-commercial users like me out of SSO features for my small non-commercial group.
I don't really need all of the auditing and compliance features this solution seems to currently offer- I just need a simple SSO proxy. If some one wants to build that, it could be a huge help for small non-commercial self-hosters like me.