My LCD has that vented JSAUX backplate installed.
I don’t know if that’s compatible with OLED or not, but it significantly reduces fan noise on my LCD Deck, I’m quite ok.
Even at the highest load, the fans only spin up to about 4200 RPM, which is plenty quiet. When using the traditional backplate, it ramps up to 6000 rpm!
Playing on Steam Deck, I’m going in without expecting much at all, I’m just happy when a game I want to play is playable. Totally changes how I view PC games.