CloudXR 4.0 - watchdog to automatically launch VR app

Hello,

We’re building a UE5 VR application that will run on Google Cloud VMs and be used on Meta Quest 2/3/3s HMDs.
We managed to get nearly everything working : we can connect to the CloudXR server on the GC VM with the Oculus VR Client on our HMD.

The problem is that the end-user on this app won’t be tech-savvy, and we want to skip having to navigate through the Steam Library to run the desired app.
According to the Documentation, we need

some custom launch procedure, that is not provided by the NVIDIA CloudXR SDK. For example, you might have a ‘watchdog’ application which waits for a client to connect and then starts the desired executable.

Is there some hints on how to achieve that ?
Some Events that can be used in the Oculus VR Client to run a command to launch the app ?
Is it something easily implemented with a custom client with the Unity’s plugin ?

As an alternative, this page indicates that we need to

Launch the OpenVR application only after the client has connected to the server unless the client has been pre-configured on the server.

Could we make it work by pre-configuring the server to be used with a Quest 3 HMD, so the VR app can be launched prior to the client being connected ?

Thank you