I use Lutris and Steam to cover everything and it works great. Don’t see a need to unify on desktop Linux, unlike the Steam deck.

Do it. It’s very easy, and then you can ditch the Roku. There’s even an ADB app you can load to remove unwanted apps on-device.

I have been using an onn 4k streaming box, which runs Google TV. They’re $20. It’s pretty easy to disable the default launcher and have it boot to Flauncher. Then you can side load smart tube for an ad free YouTube experience asking with Plex, stremio, or whatever else you want to stream.

At this time of year? At this time of day! In this part of the country! Localized entirely within your kitchen!?

Since the headline blew it, the game mentioned is called Cosmoteer.

Have you considered a steam deck? Might work for you based on mentioning a small display and wireless keyboard.