Interesting scenario, Taurus. Sounds primarily like a mental confidence exercise, though of course the gear helps the mind stay focused.

Fire, obviously, is not an option. The smell can travel a mile or more, and lead your adversary right to you.

So it's dig in, stay dry, insulate, and wait.

Which brings me to the knife of choice. It seems to me that digging will be more important than cutting. Dig a slit trench, dig holes to hide the scent of waste. So would the Cold Steel kukri you mentioned be a better choice? Or how about the Ontario SP8 short machete (which really looks like a sharpened pry bar)?

Then there's insect repellant. You know better than most how the little devils can sap your will to live. Low concentration DEET solutions are usually scented, and scent travels, which is bad. 100% DEET isn't, if I remember correctly. A few dabs on your head and neck may help keep you sane and in the game.

My two cents' worth.