I appreciate the response, and as i said, I understand that jellyfin is completely accessible from PS4 even though there is no dedicated app. Unfortunately, that's not an option for all the users in my household, which is why I'm running both a JF and Plex server.
As far as PS4 not being designed as a streaming device, the fact remains that it does stream media, and since I have it in my house, it does serve that purpose when it is not being used for gaming. I'm not ruling out the option of adding a dedicated streaming device, but I am loath to the idea of trading in one data harvesting service (plex) for another.
If you end up going in the Godot direction, a friend of mine has some useful tools to easily get started on animation rigging and controllers here.
He got started a couple years ago with no game dev experience, and he's done a couple of game jams recently, but most of his time has been spent building workflow tools. A couple months ago he finally got around working on one of the original games that he's wanted to make since he started.