This is the Spine Race I take it. Trail runners and sealskin socks might be the way.I wish you the very best of luck, the PW can be brutal at this time of year.
A couple of weeks ago I went up Ingleborough from Cold Cotes not a recognised route up as it peters out about a third of the way from the summit. I managed with the bog with the above shoe set up.Minus 5 at the summit and much more wind chill with a 20mph wind.
In dismal days you could be down to near six hours decent day light.
I have made few cones including a Flissure which didn't work our too well due to my inaccurate cutting. I warm to the this slotting over/no fingers idea. In the past I have used those little brass paper pins in holes to stiffen the joint and get an accurate fit on the pot brim.
In Cornwall (SWCP) this year I met a response from a farmer just like that mentioned by Geekinthesticks about red tape i.e about not being allowed to let people camp and I just wanted a bivy spot. It was raining and clearly by my position I was just going to go up the way and find a place.
Again it being fairly obvious I would be wild camping by my location and the time of evening I came across three different farmer,days apart,doing late chores and asked for permission for a place and they all said no.
Open fires are a no no unless desperate;then you can make cookfire the diameter of your pot with three stones. A knife is not a fire necessity as the twigs required for your fire can be broken by hand. If they cannot be broken they and the fire are too big.
Camp fires need lots of wood. It is rare that sufficient dead wood is within collecting distance and folks become lazy and start on the living timber around them and farmers know this happens.