If KSA become interested in acquiring JF-17s for its forces then an advance variant may be possible to be developed for them because western companies will not hesitate to get this opportunity and may offer advance avionics, engine or even composite material to reduce weight and making it stealthy. It may cost around 30 to 35 mil a piece but it will become 4.5+ gen fighter with that kind of input and PAF may be able to get few for its self which will help a lot specially in air defense.
One important thing is that JF-17 is also capable to carry nuclear weapons without any restrictions which may attract KSA, as there were news in media that KSA is interested in acquiring nukes, it also offer integration of weapons which user wanted so more options then other plane KSA have.