Looks like Kodi it is, lol. Which is fine, I guess. I should be able to customize it and remove the unneeded options.
My current setup only really runs Emby and Snapcast, so I haven't had to deal with any kind of launcher. It just boots into Openbox, launches FF full screen, and loads Emby. I'm aiming to add some new features to the new build since it's more capable than the old Core2 Duo laptop I dug out of the basement lol.