Yeah it is a high possibility that in the case USA really does go ahead for the F-16 V, we will get a watered sown version AESA with the F-16.
This is what I'm trying to tell u...this is all guesswork on ur part and reality is far different from it. Don't rely on hearsay...research urself...and ask credible ppl who have knowledge of such stuff. Read the explanation below(it might be a bit long) as to why what u r suggesting is completely unreasonable.
Let's assume what u r saying is true...and let's analyze it. Consider the various factors listed below...
1) Seller's reputation(US being among the top countries with a well established reputation).
This is a no brainer...US is the #1 supplier of defense equipment around the world. US has held that position for a long time. They produce some of the best defense equipment that WORKS. Militaries around the world buy equipment that gets the job done reliably...this means buying equipment that's been tried and tested. So even if we entertain ur assumption that US would want to give Pakistan a less capable radar...they would still make sure that it gets the job done. Maybe have a lesser range but still work as a radar should. This development of a radar other than SABR AESA brings us to factor number 2.
2) Cost
--> A) cost of development, testing, integrating.
-----> back when SABR AESA(by Northrop Grumman) was developed...Raytheon offered its own AESA radar(called RACR). RACR must have had similar specifications to SABR...otherwise it won't even be a competition. Regardless of that...SABR won out. I can't recall of any airforce that opted for Raytheon's RACR radar...needless to say it's not being mass produced. If what u say is true...this will be the least costly option for US to swap out the SABR AESA for Pak's F16s...
...still costly...just not as much as other options(see below).
In case of RACR AESA...development and testing is already done...I think even integration might have already been done. The way it was being offered to countries like South Korea...it seemed like plug and play(so I'm assuming they had already integrated it to work with F16). Now if RACR is selected...then Pak still gets a comparable radar to SABR...and US has to foot the bill of starting a production line of RACR AESA radar...for an order of not even a hundred of these radars. Completely counterproductive for not much gain in return(since Pak will still be getting close to SABR like radar).
Another option would be to develop a new "less capable" radar from scratch. Here the cost of development, testing, and integration would be added...on top of the cost of limited production of units. US would then have to pay an even bigger bill.
--> B) cost of "customizing a few units"
-----> it is a general rule of mass production...that the more units that are produced of the same exact spec...the lower the cost per unit. For an example...where I work...among some of the products that are made...include tablets and capsules. The production line gets set up for a certain bottle size, with a certain corresponding lid size, the label of a certain size that's gonna go on the bottle gets set up. Then when everything is in order...the production line starts rolling. It takes time...and cost(technicians setting up the production line for that specific packaging size)...so if u make a million bottles...that cost of setting up the production line gets divided over those million bottles. If u make 5 and then change up the production line for a different size of packaging or a different product...then make 10...and so on...
...then that's more cost per unit. This applies to anything and everything that is mass produced...including fighter jets. This is why the cost of the F35 has come down(due to mass production)...if they start adding customizations disrupting the production line...it will go back up. The same holds true for F16 Block 70...the US is mass producing them in one set configuration...if they disrupt the production line to add a different radar for Pakistan's F16s...the cost will go up.
3) Who is going to pay for all that cost? Keep in mind all the CSF that has been held back but is owed to Pak...that's going to cover a large portion of the cost of Pak's F16s Block 70. If these F16s weren't heavily subsidized by CSF...I doubt Pak would buy the new Block 70s(a long term commitment to American fighter jets as their tip of the spear)...given the sanction prone history. F16 Block 70(which has SABR AESA) is a very capable aircraft...if Pak isn't willing to buy that at full price(whether due to shortage of funds, or sanctions, or a combination of these and other factors)...what makes u think Pak would be willing to pay the cost of radar modification...that too a "watered down" version? This means if US is going to swap the radar...it would be the US that would have to pay the cost of that...every penny. It would be much simpler for them to just deny Pak the sale of Block 70 if SABR AESA is the issue.