I guess that nations switching from F-16 to F-35 ran up lots of hours on their F-16's due to F-35 being a long time behind schedule, so their fleets would need a lot spent on them.
I think that what would be a headache for SAAB, HAL, KAI etc would be the US offering to sell more contemporary F-16's with many flight hours left in them. I can imagine a country like Vietnam (or possibly Indonesia) being interested in enough ex-USAF aircraft for 2-4 squadrons. A couple of South American countries might be interested in a few, too. What about India;s neighbour? I don't suppose US would sell them to India's adversary.
Bangladesh was a candidate, but the meeting with Bangladeshi FM and US Sec. of State didn't go very well, that's what I am hearing.
Shunning Belt and road to get on board Indo-Pacific framework of USA was probably the stumbling block.
And our western neighbor? Is USA planning for some gifting/ charity.
Sri Lanka? If USA shields their back side in UN human rights voting, then definitely.
Afghanistan? ( They also are our neighbours) Have they graduated from turboprops?
Nepal? Better directly sell to China, as allegedly, the country is run in proxy by Chinese ambassador.
Bhutan? India haven't got any request for construction of any airbase from them. So no.
Myanmar? Is USA planning to barter Su Kii with used F16s?
Maldives? Yeah. Real contender. Additionally USA can construct a big ass base there, if they get kicked out of D. Garcia.
Am I missing any neighbours?