Yeah, but the main goal is to bolster our forces against China, not Pakistan. So we will not have any restrictions against China when it comes to the US. The Americans are more worried we will invade some small country using their weapons, rather than Pakistan or China, in the future, as we become more powerful.
The French and Israelis don't care what you do as long as you don't go around killing civilians, and we are also good on that front since we don't.
Weapons systems are not leased, generally, unlike the Akula which didn't have the buy option, but exceptions can be made. We have deployed some Israeli owned SAMs in Ladakh right now, those can be converted to a term lease for example, with a "you use them, you buy them" clause.
Can't simly lease weapons systems that we do not operate in the first place. Or else there's no point to deploying it quickly, it will take years to train the pilots for F-16s, for exmaple.
The French have lots of Rafales in surplus.