Alright, let me try to make it clearer.
To run DCS with the native OpenXR runtime of Virtual Desktop (VDXR), simply follow the 6 steps below.
1. You need to install the latest beta version of VD, 1.29.3.
2. Launch the VD streamer app, pick VDXR as the OpenXR runtime.
3. Disable the OpenXR toolkit for DCS. This is based on my test.
4. Check your shortcut for DCS. You need MT & OpenXR.
The command line will be like
"C:\DCS world\bin-mt\DCS.exe --force_OpenXR --force_enable_VR"
5. Launch the game by double clicking the shortcut.
Note that you don't use the "Launch Game..." menu of the VD streamer app.
6. Do a pre-flight check, make sure VDXR is enabled.
And here's my game streaming setting for VD.
I'd recommend the Snapdragon Super Resolution, this is by far the best upscaling solution I've tried on Quest 2, saves a lot of GPU power.
My rig has a i9-11900k cpu, rtx3090 GPU, 64G mem, My GPU usally runs at 55% for single player scenario in good weather.
With SSW on, it has some artifacts to bump the FPS in headset to 90, while GPU is throttled at 44fps in most of time.