Kde's new Plasma Login Manager / Plasma Login (backend/frontend) have been coming along nicely (replacing sddm), and include remote login support. Just announced this past spring but very active. https://blog.davidedmundson.co.uk/blog/a-roadmap-for-a-moder...
That's exactly what I was talking about before. Tried on newest fedora but that simply isn't it. It's remote support to an existing session. Names are misleading.
