I've been thinking about the subject of save-or-die rolls recently. One way to use the ones from Crown of Salt without changing anything about them is to make them obvious to the players. Saying "there's an old, rotting rope ladder here" or even going as far as "hey if you use this rope ladder, there's a 1 in 3 chance it breaks and you plummet to your death". This encourages the players to think of workarounds (e.g. tie their own rope). And if they can't or won't, there's always the informed choice to gamble with the 1 in 3 chance of death.