I think minigalaxy might be your answer
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Both Lutris and Heroic Launcher allows for integration with GOG accounts. Worth checking out.
Junk Store on Decky Loader will do GoG as well as Epic, but you do have to pay for GoG integration or subscribe to their Patreon
Regarding cloud saves, Heroic will let you download or force download them. After that you would just need to place them where they are expected for the game.
I use Heroic on desktop and deck and am a big fan personally.
I can download them from GOG. How do I use them?
I believe Heroic Launcher does all of that, minus the saves. That's going to be on you to manage regardless.
Heroic has support for cloud syncs. I have very few games that are not supported. Like Baldur's Gate 3, but it's not on Gog side.
Lutris is pretty good
No Windows version though