gamescope sounds like exactly what you're looking for.
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Awesome, thanks. I will dig into it.
Just wanted to report back that this worked perfectly.
That's great! I'm glad it was that easy.
For any one who finds it in the future - I just set a Steam launch with gamescope set to half my native resolution, fullscreen and enabled fsr. Games run at the weird 1128x752 and FSR makes it look even better but I get great performance.
If gamescope misbehaves, proton-ge releases include wine fshack with fsr capabilities. Select proton-ge as the compatibility tool and add WINE_FULLSCREEN_FSR=1 %command%
to the launch options.
Once in game, select any resolution you like, and it'll scale it using fsr to your display's resolution.