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Luftwaffe
For arguments sake. If the Saudis want a hi-lo mix for RSAF or SANG, they'd come up with a list of requirements which we would have to meet. Block-III is on the drawing board, if they join in, we can push the envelope to meet the demands and create a more potent Block-III as the R&D costs will be shared. They can effectively partner in the program.
As for the sub systems. JF-17 was designed as a 'cost effective' platform, and till Block-III is raised, our ability to deliver more advanced systems will grow. If they wanted more systems, they can buy from European suppliers which can be integrated.
Btw, India has reportedly offered Tejas to RSAF.