Your Rov already paskened you cannot engage in Mesira. You’re telling us you want to be a Moser anyways and disregard his Psak, possibly putting an innocent Yiddishe mishpacha through the gehenom known as CPS and the goyishe courts? In halachic terms that’s called retzicha, hence the halachos of mesira and your Rov’s Psak.
Make sure you ask a Posek before anything.