I was quite surprised with the development of the JFT-B version. It basically had to go through 80% of the testing because a lot changed, from the materials to the aerodynamics to the CoG (Center of Gravity). Yet, they went through with it.
A delta wing would allow the JFT to be a plane that can be the best strike aircraft for PAF. It would save the PAF from having to buy something like the JH-7A or another new platform, which would not only be expensive foreign exchange wise, but also require a whole new set of maintenance and other sustainment investments.
A delta-winged JFT would require none of this. With large conformal fuel tanks and the new more powerful engines, they would easily be able to cover the strike range requirements of PAF. Large delta wings would allow a heavy weapons load, along with more fuel. Basically, it would be like what an Su-34 is to a FLANKER.