if you are up against tight limper`s then u may have to limp with it yourself,But KK is a top hand,if no preflop raise,it`s best to atleast shoot out a feeler bet to find out if you are up against another good hand,if u see the flop and you feel your are ahead then I would bet hard,especially if not raised at the flop.depends on position obviously.
you don`t won`t someone to suck out,and at a final table I would want KK to add to my stack size and would play it hard 9/10 times.
I have 2 styles of play,
and the best one is playing what you consider good starting hands very hard at the beginning of tourney,then hopefully I get some chips and can sit back and wait for the nutz lol,if they ever come.!!!

I would always push high cards final table.

KK is a great hand, so push it!
Sitting before bigstacks you should raise to 3BB and look where you stand, only play carefully in multiway pots with raise and reraise!
If they all short behind you cover them with the cowboys!