I hear keycloak has quarkus builds as well these days which should be much slimmer than how it used to be built.

Consider reviewing odoo, I last looked at them when they were known as openERP, I know one guy that runs it and is happy. It might be a bit much if you just want a CRM…

Self host all your stuff and use tailscale if you just want to provide private services to yourself

Personally I prefer oidc as it plays a central role in my setup, but have you seen other integration issues not related to oidc?