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Easiest way is to use heroic. You can easily install it from the discover store, log in with your gog account and click install. Then right click and add to steam directly from the heroic interface, this way it will show up in the deck game mode.
Ps: I know you wrote you don't need a fancy launcher, but this is legitimately the absolute easiest way to go about it.
Install Heroic. Log into GOG account from Heroic. Go into settings and click "automatically add games to Steam". Click install. Click launch. Cross your fingers.
If you don't want to go the Heroic route (you really should go the Heroic route) you can
Trouble with that method is that Steam always creates a new Wine prefix (a kind of fake Windows drive) every time you run a new none-Steam-game with Proton. They can pile up and take unnecessary space away. It also makes it harder to install dependencies or mods or add ons.
So yeah, Heroic is the way.
There was a similar question some time ago, so I think it's worth linking it: https://lemmy.world/post/19546682
Also, check my answer there for a solution that does not rely on a launcher: https://lemmy.world/post/19546682/12260141
Add the exe to steam
Right click it and set force compatibility to proton
Run it and install into steam
Should run after
Or do the heroic launcher method other people suggest
Adding to that, iirc the user needs to change the EXE on Steam after the install, else Steam will keep trying to open the installer.
Funnily enough I tried to do this with battlenet and it didn’t work but if I just run the original added installer on steam it auto runs properly
That's because every time you run a new program with Proton on Steam it creates a new Wine-prefix (fake Windows drive). So when you run the installed battlenet.exe it creates a new Windows environment where Battle.net is not installed.
But the installer is using the environment where Battle.net is installed and apparently it has a function to run Battle.net when it detects that it's already installed.
Unfamiliar with Battle.net, but the problem sounds like a case of DRM and the solution sounds like the installer tries to normalize launchers and you are able to leverage it.
Something to consider: https://www.youtube.com/watch?v=Ay6C2f55Pc8
https://github.com/Faugus/faugus-launcher