No problem with the long post Drebin my friend, better long &clear than short and imprecise.
First on the "light" thing. Most numbers for the Thunder are around 80% of the equivalent ones for the Falcon of the blocks owned by Pakistan! The avionics are not superior either? Its only valid superiority is that it allows the PAF to use BVR missiles which is awesome on a national level. You should really keep in mind that the JF_17 will likely face TEJAS, MiG-29 or 27 in a war with India, Mirage 2000 at best! The Su-30 and Rafale if/when MMRCA comes thru will be for China? Which then explains why numbers are just about meaningless outside of scenarii and strategic tactical considerations. Let's be honest that if a new war had India and Pakistan facing each other and no one else involved or intervening so that both used all their might, in the air, India would win if only by attrition of numbers of the PAF fighters?
Moving on to your plan for it.
There are two problems with your idea, IMHoO. First, selling relatively recent US planes is harder than it seems. You'd have to sell these to a nation that the USA fully supports otherwise they'd quickly become useless for lack of support, bombs, parts, etc? Those are rare as if they have the money for it, the US will prefer to sell them new planes or barring that sell them used ones from the USAF?
The second bug is that as long as the USA meaningfully services the F-16s sold to the PAF, they should be kept in function to fight in the scenario outlined above of facing India.
The alternative that I would favor goes towards sales of the JF-17 itself? I did write in the export thread that too much should not be expected but there is a market, you know? Any Nation not wanting to align to RU-China and too poor to get the expensive Western toys ( Raffy-Typhie or even Gripen ) should consider the Thunder. Just think that even the South Africans are finding their Gripens expensive to run? And let's keep in mind that most rich Muslim nations buy Western uber-jets and that selling to Iran would break the bond with America?
From this, we can draw a plan :
1- state a neutral selling strategy : not to rogue states nor religiously driven;
2- plan to use the proceeds to fuel development of the JF-17's blocks thus insuring new (re-)orders;
3- put the rest of the money in the future aircraft of the PAF whether that be a buy or ideally a co-development again but this time on equal footing or with Pakistan as main designer?
That would already be a big and quick step-up! Most countries that tried either failed or took much longer? As for the market itself, Argentina or heck, even Afghanistan could be prospects. Granted that the tensions with your neighbor contradict that last idea but that is in fact one way to subdue them? IE. They'd be relying on **** help and you'd have little to fear from their AF?
Still, elsewhere as in Africa there could be markets opening. As a matter of fact, unless an agreement with China was signed, places on the continent that can't afford J-10s or align to the Chinese would likely be fine with the Thunder for a reasonable self-defence force. In addition to which, if the PAF uses its image of having professional quality pilots, some could be sent along to fly the things as many African nations do not have those?
I know all this seems to run far into the future and that your proposal carries more weight at the moment ( except for selling the F-16s really ) but it is with vision that one builds tomorrow. Anything else is merely growing old?
Talk to you soon, have a great day, Tay.