PAF probably has an appetite for 36 odd new aircraft. If J-10B then it won't be more than that in my opinion. J-10B is newly developed and systems may not have matured you yet. None out of us here can tell if AESA in J-10B works flawlessly. Only Chinese know it and if there are issues which need to be ironed out then PAF will have to wait a little more. If there are no issues then it might present a good option. I don't think China will transfer technology just yet. After all this is their latest most advanced tech. US does not transfer technology either. Europeans and Russians do. As an immediate measure F-16 presents good option in my opinion. 36 Blk 61 or higher will calm down our Eastern neighbour and will be quickly absorbed given our experience with aircraft. Add MLU upgrade of Jordanian F-16 and you have got sufficient force to deter any misadventure.
Another good option could be EFTs. They are good aircraft but a better deal will have to be negotiated. Typhoons are quite a match to Rafael in aerial combat.
Let's not forget Gripen here. This little aircraft has some neat tricks up its sleeves. Gripen NG has some unique advantages in networked environment (swedes pioneered datalink technology). It also integrates seamlessly with our AEW&C aircraft. Transfer of technology is also offered by Swedes.
With any of these options PAF won't go wrong but F-16s present immediate solution. You can later add a third type by reducing JF-17 numbers by two squadrons or so. These can be J-10s, EFTs, Gripen or something else. Hopefully if money becomes available we may be able to afford them down the lane.