In China's case, the incentive to sell Pakistan turnkey ToT (i.e., everything in the missile, including the sensitive dual-motor rocket tech) depends on whether it's ready to part with Pakistan as a customer. For China, that is the cost of ToT, and the price will be quite high as it will look to offset lost potential sales from the future. This is, of course, assuming it'll even entertain such a thought.
The ideal entry angle would've been to co-fund more programs with China, but in truth, the Chinese don't need us in terms of their defence industry. They have sufficient internal funding and economies-of-scale. It's no wonder that the only true joint-venture we had with them was the JF-17/FC-1, and it's unclear that we would have an option for a second in the future. This could be a reason why the PAF is pursuing AZM as an original design.
However, if one wants to localize AAM and SAM technology, then the likeliest entry-point is working with countries that
need economies-of-scale and
need co-funding for R&D.
Turkey might, but I'd argue even its needs aren't as urgent or pressing as say South Africa and Ukraine. Not only that, but we know for a hard-coded fact that those two countries also called for such collaboration with us:
In particular, there were negotiations with the leadership of one of the scientific and Industrial organizations of Pakistan. Terms and conditions of the launch of joint Ukrainian-Pakistani production of high-precision missiles of different classes were discussed. The parties confirmed readiness to start joint research and development works in the coming months.
https://ukroboronprom.com.ua/uk/med...pilnogo-vyrobnytstva-vysokotochnyh-raket.html
Acquisition of defence equipment as well as cooperation in Research and Development (R&D), Transfer of Technology,Coproduction/Joint Ventures in public as well as private sector, also fall within the domain of the signed MoU.
http://www.dod.mil.za/news/2017/03/mou_pakistan.htm
Be it technology for BVRAAM, WVRAAM, SAMs and SOWs (including miniature turbojets), we can work with South Africa. Likewise, for ramjet technology and rockets for BM/SLV, we can learn from Ukraine (albeit within limits as Ukraine's in the MTCR).
Ultimately, the decision to do so depends on whether our armed forces can hold the fort for a longer period of time (vs ad hoc off-the-shelf buys) to let the R&D gestate.