Regarding aircraft for your Navy, if you are confident with the production of your joint venture fighter with Chinese, the JF-17, my sincere recommendation would be continue the production and simply produce additional 60-70 units for your Navy.
From what I understand in this thread, many of Pakistani members here have disapproved the possible development or acquisition of an aircraft carrier, which means that your Naval aviation will remain for coastal defense rather than power projection. Due to this intention, you don't need to re-design this fighter for carrier take-off/ landing like the Russians have a separate version of MiG-29 fighters for their future replacement of SU-33s.
The main advantage would be the less cost per unit of production and also the experience gained from churning out more units. I believe yours being a brown-water navy (coastal defense only), this is the most sensible step. New aircraft, domestic technology, relatively in-expensive and reliable in terms of your apprehension of American sanctions.
Your other better choice would be the Sea Gripen being developed in Sweden.