Hey @jonasdn, apologize for the late response.
If you take a look at our Process for reviewing classic confinement snaps, the need to launch arbitrary applications is not generally considered a supported use-case for classic confinement. So unfortunately this request cannot proceed as it is. You could ship any application (e.g. stage-package) in your snap but I assume this is not a valid scenario given what you have explained. Can you please confirm?