Just need to be more clear about our objective from the off set in this hand in my opinion, if you say you're main aim is to ladder + you dont want to get

in preflop vs this player then folding is a better option than 3betting and folding (because that protects our stack - as shamefully nitty as that is)
If you think this a spot where you have to get it in, then think about how you can exploit your opponent at the times he has weaker hands - cos every so often he'll have

and

and ofc he's never folding, so it doesn't matter how we play vs these hands, think about hands that we're in good shape against that he can have and how best to make him go all in with those hands
Either option is viable imo as long as you decide beforehand, then act accordingly - its just a disaster to make a play at this stage of a tourney then half way through stop and make these big decisions, we should have decided before we put a chip into the pot + this applies to £5 freeze outs with £15 ladders and the WSOP main event imo.