Spatial Integration works on a Steam Deck!
The Flatpak packaging of Spatial Integration allows it to be installed on just about any Linux device. It only took a few clicks to get it working on a Steam Deck – just download the installer file from the SI web site then click on it. The Steam Deck already has Flatpak installed.
The image below shows the Eloise example project, which can also be downloaded from the web site.
Controls: Use the right joystick or haptic pad (easier) to move the mouse. The right trigger works like the left mouse button, the left trigger works like the right mouse button and press the left haptic for the middle mouse button.
You need to be in Desktop mode, which is available from the Steam->Power menu. You can install QGIS on there too!