Cooperation with Pakistan is something that the GCC countries would never do. They are very rich and buying something like JFT that has a price tag of $30-35 million is too cheap for them to even consider. They are arrogant people and take pride in the billions of $$$ they have.
Secondly they are not interested in R&D, while UAEAF was buying Block 60s they paid a lot, almost $3 billion in terms of R&D cost. Research and development that was done in USA and only by USA. If PAF was striking that sort of a deal they would certainly have asked for maximum local manufacturing. However UAE is happy in purchasing off the self items and who could blame them they have the money to do it.
Another example are Saudis they spend 3rd largest amount on defence and the amount of self sufficiency they have is nothing even close to what a country spending $80+ billion must have. They have all the fancy toys Typhoons, F-15s, Abrahams, you just name it they have it or must have considered it at some point but they are all purchased off the shelf items.