Very Simple XPC

I want to use the XPC technology simply to launch an

app

The only documents that I can find on the internet show a complex structure, with code for the XPC service, separate code to launch the XPC

service via a script, and app code to communicate with the service.

In other words, I only want something that does the equivalent of this:

NSWorkspace.shared.openApplication(at: path, configuration: configuration, completionHandler: nil)

but with XPC. So I would need something along the lines of:

let listener = NSXPCListener.service("/path/to/my_app.app")
listener.resume()
RunLoop.main.run()

Obviously, the service method does not take an argument that would be an executable path, so this does not work.

How can I do that ?

PS: to explain the motivation, launching an XPC service will preserve sandbox restriction form the launching app, whereas launching the app directly via

NSWorkspace.shared.openApplication