The train cannot use the route between kurla and Panvel you mentioned. It is dedicated emu section (harbour line) with emu running every 4 min. Moreover no connection between main Line and harbour line at Panvel. If u want a train to Pune via Mumbai, you cant enter actual Mumbai.
1. You can either reverse the train at Kalyan.
2. Or take Kalyan-Datiwali (no halt at Datiwali)- Taloja-Panvel route.