What is his cBet stat is that low or high. There are reg's that only cBet like < 40% of hands and thus only continue with good hands. They often bet bigger sizes.

you are folding around half of your range on the flop (so will call pretty much all 2x,6x,Kx and some PP).
On the turn you folding less than half of your range (so almost all 2x,6x without FD, weak FD,PP).
Folding any Kx is exploitative here and unnecessarily weaktight play

I think this is a mandatory call OTT.

A fold is acceptable if he only bets KQ+ OTT with 0 draws/air => always barrels river, which i think is unlikely unless you have this strong read, I could totally see someone taking this line with KJs-K9s to check back the river, or be betting a draw/air and plan to fire the river sometimes in which u can sometimes bluffcatch, blah blah

I would add this combination in my 3betting BB range. since it has playability and BU raising range should be super-wide, where JKs is crushing its equity.
I mean i wouldnt even care if villain has low 3betfold%, since im dominating all of his TJ/JQo/55 type hands equity wise, while JKs flops well.

*) As played, i would call turn. and probably call most river. This is probably top of ur range. and with villains stats, he's not that tight to warrant any fold turns.