

I’m running a Steam OS like experience on my Lenovo Legion Go. Not quite a steam deck, but very similar.
You should be able to use the heroic launcher. And you should be able to install it as a flat pack or a snap. That will make your GOG games as easy to download and install as a steam game. If I recall correctly, it even automatically adds entries for steam.
I regularly play Bomb Rush Cyberfunk on this device using the GOG edition.
I liked it just fine!
I know there are a lot of Asimov diehards that found it disappointing. I don’t know why. The iRobot book wasn’t even really a book, it was a collection of short stories. Not exactly an easy thing to adapt to a movie.