The issue with that submarine, is due to its large displacement and limited power on conventional Or even AIP propulsion is it won’t have the speed to evade subs hunting it, and won’t have the means to go further out at speed.
But with nuclear power, it can hide in a larger area, and sprint away if it is likely to be detected.
In the mean time, VLS addition to the hangor can add second strike capabilities for cruise missiles to be fired from Pakistan’s EEZ.
1. Nuclear submarines are too sensitive. China is currently strongly criticizing the US for helping Australia build nuclear submarines. If China were to provide nuclear submarines to Pakistan, it would clearly be inconsistent with China's national policy. This possibility is virtually nonexistent, at least for a long time to come.
2. The Type 32 conventional submarine is not suitable for use as an attack submarine. However, if it is only used as a second-strike platform, the Type 32 conventional submarine is a reasonable choice. China's current Type 32 conventional submarine was built more than a decade ago for experimental purposes. Its platform is essentially an enlarged version of the Type 039 submarine. If new construction were to begin now, it would certainly incorporate more of China's latest technological advancements from the past decade, such as propulsion systems and VLS.
My view is: Based on the Type 32 submarine platform, customize it according to Pakistan's actual needs, rather than directly purchasing Type 32 submarines. Alternatively, based on the Type 095 nuclear-powered submarine platform, convert it to a conventional-powered submarine.
You can think of it as a completely new submarine custom-made for Pakistan.
Of course, since the PLAN itself doesn't have this need (for ultra-large displacement conventional submarines) to share the related R&D and technology costs, if Pakistan is interested, it will either need to pay substantial additional R&D costs for the modification, or it will need to purchase in sufficient quantities.
The focus is on the submarine platform itself, not a single technical feature.
However, this is merely my personal opinion. It's for entertainment purposes only and shouldn't be taken seriously.
IMHO, I think the last three hangor class subs should have a dozen VLS tubes (of the standard 0.85 m diameter of the Chinese UVLS) to be able to fire missiles like the YJ-17 or YJ-20 as well as hypersonic cruise missiles like the YJ-19, and stealthy cruise missiles like the AKF98A.
1. Hangor-class submarines do not have a VLS. They use torpedo tubes (533mm) to launch missiles or torpedoes. There is no space for a VLS.
2. China's surface warships currently primarily use two types of VLS: the HT-1 (850mm) and the AKJ-16 (650mm).
3. Submarine-based VLSs are mainly equipped on strategic ballistic missile nuclear submarines. Official detailed parameters have not been released, but their dimensions are estimated to be very large (no less than 1500mm). They are used to launch submarine-launched ICBMs. Attack submarines use VLSs smaller than this, but no data is currently available. It is generally believed that their size is larger than the HT-1.