Probably not gonna happen. Ask a Chinese to choose between pork and Pakistani wife, its always gonna be pork. Plus CCP will not allow conversion of Chinese to Islam and Pakistanis will not quit Islam. CCP wont allow Uighur to marry Pakistani women for fear of radicalization later on. Both are fundamentally different cultures with nothing in common, which are coming together because of strategic reasons and will move away when there are no strategic reasons for it.
Though marrying Chinese might lead to bigger gene pool, which at present is quite restricted due to certain marriage practices.
https://en.wikipedia.org/wiki/Heterosis