Hi,
Fly-by-wires are not something new, or out of this world, incorporating them into Mirages would not be difficult either, Chinese FBW systems present on the JF-17 although are very modern however are not catastrophically hiking the jet's price, infact the aircraft to first fully incorporate a a digital FBW cost about 3 million dollars, hence if an entire jet with FBW and everything costs 3 mill a pop, it's doubtful PAF and PAC would have any sort of problem,
Furthermore as I earlier said, about experienced pilots "flying" these birds, that means they are well experienced about the aircraft's performance envelope, and have almost a sixth sense in controlling their aircraft.