How to: iCall triggered on monitor status changes

Hi experts, I need trigger a script regarding the objects status changes.

Is there an best way to do this without the need to change the user_alert.conf?

My approuch:

sys icall handler triggered network_upd_handler {
    script network_upd_script
    subscriptions {
        OBJECT_STATUS {
            event-name CHANGE_STATUS_EVENT
        }
    }
}

sys icall script network_upd_script {
    app-service none
    definition {
        exec /bin/bash /var/tmp/update.sh
    }
    description none
    events none
}

user_alert.conf
alert NETWORKMAP_UPDATE ".*monitor status.*" {
    exec command=" tmsh generate sys icall event CHANGE_STATUS_EVENT"
}

I thank you!