You just stated the reason why I personally don't buy watches with cloned proprietary movements, whether it's Rolex, AP, Panerai, Omega, or any other brand.
If one of my watches, GEN or replica, needs service, I know that an ETA, Sellita, Miyota, or Seiko can be serviced anywhere in the world without running into a wall or getting a door slammed into my face. As far as Panerai goes, anything that starts with a P is a no-go for me, always has been. That's why I'm such a fan of vintage Panerai; even the highly-modified 7750 in the Bronzo makes me uneasy.
In all fairness to the hobby, however, a plain service of a GEN luxury watch is usually way more expensive than purchasing a replica of such model, so in the end it's a win-win.