That will be a problem if block III needs to field PL-10. Maybe they can be used in conjunction with PL-5?
The JF17 is a small fighter with few enough hardpoints as it is. Using 4 to carry short range missiles would not be ideal, and indeed would negate much of the benefits of the BLK3’s new ASEA radar.
In theory it shouldn’t be that hard to integrate PL10 seeker and electronics into the PL5 airframe to make a PL5X that is roughly comparable in terms of seeker and off boresight performance, but will suffer from shorter range compared to the PL10.
The PAF would likely bite the bullet and pay for the development work given how much a boost such a missile would give to its JF17 fleet.
OTOH, it is also possible that the PL10 is close enough in confirmation to the PL5 as to allow the same aerodynamic benefit as the PL5; or it could prove much easier to make some changes to the PL10 airframe to make it achieve the same aerodynamic effect rather than trying to transplant the PL10’s internals into a PL5 body.
When we boil things down, the key difference in terms of aerodynamic shapes of different missiles is created by the control surfaces. The PL8 has rather oversized control surfaces, which is why it probably spoilt the aerodynamic benefit of wingtip mounting on the JF17. The PL10’s control surfaces are much smaller and more in line with the size of those found on the JF17. So maybe making some small adjustments on control surfaces of the PL10 would be enough to retain the aerodynamic benefits of wingtip mounting while also retaining the majority of the PL10’s performance.
The final possibility is that the PAF is betting big on BVR (which might also explain the choice to not integrate an IRST), so they are prioritising their funds on better radars and BVR missiles over dogfighting missiles and HMS/Ds for now. The above mentioned new WVRAAM would still be an option as a later upgrade to the whole JF17 fleet.