First of all, Pakistan have a very limited coastline compare to India, which mean unless PN buy ship and dock them in China (which will be a day or 2 to get to Pakistan if war broke out between India and Pakistan, if at all because they would have to go over Indian coast to get there) You put a big ship in limited coast, you basically just put a giant target on your back. You can't go unnoticed when you operate a 15000 tons ship off the coast of Pakistan, Indian satellite will pick that up in a heartbeat.
Small relative to what? 1000 km coastlines isn’t small by any stretch of imagination for a 440 ft boat. Indian Oceans alone is way too big for any Navy in the world.