SSO for forum on my Ghost site

Hello! I’m trying to figure out a way to add a forum/community to my site, that is only accessible to paid members. I’m aware of the Discourse-on-Ghost workaround to handle the SSO issue, but I don’t want to deal with setting up another hosted location for the code. (Did that once already.)

Am I correct in assuming that there is no relatively easy way to integrate Ghost with anything else with single-sign-on? I don’t mind writing some code (or paying someone to write it). My ideal setup would be a forum embedded in my site, so people don’t have to go somewhere else to use it.

As I said, I know about DOG, and appreciate all the work that went into it. I’m just wondering if there is another way to do SSO from Ghost. Thanks!

One possibility might be to embed the forum on a page only accessible by paying members. They’d still have to create an account and sign in separately, though.