Good idea. As a trainer definitely. But as a combat fighter it is quite a bit suspect. This plane is not going to hold its own against even a 4th generation plane. Never mind a 5th generation one.Pilots of a 5th-6th gen naval carrier based fighter would go from land based Hürjet straight to the naval one, which would include training on some specific naval weapons and systems.
Personally I'm not a big fan of using Hürjet in combat, but an armed, naval Hürjet for advanced training is necessary.