There is not much to add on top of what you've written, but if I could add something, it will depend on the margin of gain the new tank would have over the al-Khalid. If the margin is significant enough (relative to Pakistan's geographical realities), then I actually wonder how much of an impact price would have on the Army's decision. I am not saying price is going to be irrelevant, but the PA may be willing to acquire a stellar machine provided the payment and/or purchase terms (i.e. the minimum number one could buy in a batch).
That said, there are a number of problems with a non-Chinese tank: Support. I'll be honest, it may not be worth going for either Altay or K2 if neither vendor is willing to part with sensitive technology, which in turn could go into al-Khalid. If one could get new armour, electronics, propulsion and active protection technology from either one of these tanks, then taking the risk for relatively few risk-prone units may be worth it if in return we can one day field 1000+ al-Khalid III and IV with that technology. IP issues could be a problem, but then again, we can ask Turkey and South Korea to infuse an offset into our private defence industry, which could then support our armed forces. That may add a layer between the technology and whatever risks they perceive from China.